Is Daenerys Targaryen Mānglik ?

Yes.
This is the question that deserves some attention.
In Marutarṣi's epic Himāgnikāvyam, Dhanalakśmi Thyāgarājan (a.k.a Dhanam) is one of the two principle characters (the other being a mūḍha by the name Jonardhana Swāmināthan). She is the only surviving member of her family and the mother of Ganḍaberunḍa-s.

Dhanalakśmi summoning her Ganḍaberunḍa
asdasda

Now that five kāndā-s of the epic are complete and every one is worried about the fate of Jonardhanā (which is typical of the patriarchical society we live in), we are bound to ask if Dhanalakśmi suffers from acute Sevvai Dosham (Mangal Dosh or the curse of Mars).

Unfortunately, Marutarṣi has not provided Dhanam's date or time of birth and so our astrological scientists are unable to draw her horoscope and tell us for sure. However, the miserable way in which her marriages failed give us strong evidence that she could indeed be a Mānglik.

Her first marriage, which was forced upon her, by her brother, Visleśa Thyāgarājan, started with what can undoubtedly be called marital rape. However, those who have a strong influence of Mangal on them possess "endurance, self-confidence, strength, courage, great organizing ability, independent spirit, and strong determination power."1 Because of this, she was able to turn the marriage around and bring reform in her husband. However, the happiness was short lived as, her husband was badly wounded soon after, went into a vegetative state and had to be "released" by Dhanam herself. The child, resulting from the union, was also still born. Her husband's horse was killed and, her tribe deserted her. Not to mention the marriage resulted in the death of her only living relative - her brother. The only good thing to come out of the marriage was the birth of 3 Ganḍaberunḍa-s which gave her enormous leverage later on in life. (These too, she finds extemely difficult to control)

Her second marriage, also forced on her (by herself, this time) did not even take place. The groom's death came as swiftly (and out of the blue) as the Ganḍaberunḍa came to his mother's rescue in the penultimate chapter of the 5th kāndā.

Hizdahr zo Loraq thinking "Why did I not contact Vādyār māmā ?"
sadas

Thus, based on these evidences we can say with significant confidence that Dhanalakśmi may indeed be suffering from Sevvai Dosham.
(Additionally, we can say that influence of Mars is strong on the Thyāgarājan family itself. Given that the house sigil is red in colour (which is Mar's colour) and their words are "Fire and Blood", reflective of the fact that the Fire is the element of Mars.)

Thankfully, our Vedic science of Jotiśya offers ready solutions for this problem.    
1. She must wear a coral-red gemstone. She must also discard her favourite blue dress and wear dresses which are predominantly red.

2. The lucky number for Sevvai is 9. She may remember this for future nāmakaraṇam and other rituals.
3. She may try to remove the dosham by performing "a ceremony called a kumbh vivah, in which the manglik "marries" a banana tree, a peepal tree, or a silver or gold idol of the Hindu God Vishnu."2
4. Or, the next time she must marry someone with equal Sevvai Dosham.  Since she herself does not possess her horoscope, she can have her thumb impression sent to Vaitheshwaran Koil (in Tamil Nadu) where there are some reliable match-makers (based on Nāḍi Jośyam).
5. She may as well come there herself since Vaitheshwaran Koil houses the shrine of Sevvai (or Mars or Angaraka) to whom she can pray and, receive blessings and, good grace. (She should bring her loyal guard Jorah, who is suffering from skin infection. The Lord Vaitheshwaran cures all diseases. Jorah must take a bath in the temple tank and offer abhishekam to Lord Vaitheshwaran.)

Our ancient rṣi-s who developed the science of Astrology provide practical solutions to all problems of one's life. Even if that person is a fictional character.

Jai Shri /insert name of ishta-devata/

Kot

In a village, there lived a chicken called Kot. Kot was unlike his brothers and sisters. While they pecked at the earth searching for worms, insects and grains, Kot looked up and wondered what it all meant. He would go to his father and ask him what was there beyond the coop and the farmer's house, or what was the bright thing moving in the sky, or why the cow gave milk but hens didn't. His father simply ignored him- he was too busy finding worms, insects and grains. So he went to his mother and asked her. She yelled back at him and told him to stop worrying about such things and get busy finding worms, insects and grains. Kot asked her, "Why?" to which Kot's mother yelled at him once again.

Kot kept looking at the sky in speculation. Soon he started to grow lean and his mother was very worried. She repeatedly complained about him to his father. After a while, tired of the hen-pecking, quite literally, he decided to have a word with Kot. He went to him and said, "Kot, why don't you peck at the ground like the rest of us?". Kot asked him again, "Why ? The farmer already gives us seeds and grains. Why should we peck at the ground looking for worms and insects?" Kot's father said,"Oh! Do you think we peck at the ground looking for worms and insects?!", Kot said,"Of course, why else ?". Kot's father said, "Kot, let me tell you the real reason why we peck at the earth. You see, long ago, when there was no coop or farmer, all  living beings used to live on the ground. Soon, there was no space at all on the ground to live and all animals started fighting with each other over one another's space. Then a magical needle appeared in the sky and a voice said, 'If you pierce yourself with this needle, you will get the power to fly and you need not fight for space on the ground. You can live among the clouds and build your nests in the mountains'. The eagle pounced upon the needle and pierced itself with it. Immediately, it started flying high among the clouds just as the voice said. It gave the needle to the hawk, which also started flying but not as high as the eagle. One by one all the animals which wanted to fly pierced themselves with the needle and started flying happily. But they found that the power of the needle was gradually decreasing. When it came to the pigeon, they found that he could fly only very low and that too for only a short while. The pigeon passed it to the peacock. The peacock pierced itself and found that he could not even fly as high as a tree. In rage, he threw the needle away, instead of passing it to the hen, which was standing right behind the peacock. The hen too wanted to fly, but now he could not do that since the needle was lost. So, he started searching for it with his beak. To this day, we hens peck at the ground looking for that needle, not to search for worms and insects! If you really want to know what lies beyond the farmer's house and the hills, you should look for the needle, so that you can fly anywhere you want. Who knows, after lying around unused for all these ages, the needle would have got back its original power. You will be able to fly as high as the eagle. You would like that, wouldn't you?" 

Kot listened to him as if transfixed. The thought of flying among the clouds filled him with great enthusiasm. He immediately started pecking at the ground looking for the needle. He told this story to his brothers and sisters and they too started pecking at the ground hoping to fly as high as the eagle. As a result, they unearthed a lot of worms and insects which they unconsciously ate and became quite fat.

Now the farmer bred hens just for his family's needs. But when he saw such plump hens in his farm he decided to sell them to the butcher for he was sure that they would fetch him a hefty sum. So, one day he picked up Kot and all his brothers and sisters and took them in his truck to the market. Sitting in a cage in the truck, Kot felt very happy. He was moving so fast that he thought he was flying. He told himself that he might have found the needle without knowing about it. "Even the eagle might not fly so fast," he thought to himself.
But his happiness was short-lived. After sometime, the truck stopped and all the cages where stacked outside the butcher's shop. As expected the farmer got a hefty sum for the hens. Now, Kot and his brothers and sisters sat there in the cages failing to understand what was happening. Soon, they started hearing hens screaming. Kot asked a hen, who was in the cage below his, what was going on. The hen replied, "I don't know. The man there come here every now and then, takes one of us behind that little wall and we never see the hen again. All I know is that there is lot of blood."

A few days later, the butcher opened the cage and reached for Kot and his brother. His brother started to screech, "Brother, brother ! What is going to happen to us?" Kot had no answer. He was too stunned to say anything. The butcher took them behind the little wall. He tied Kot's legs and hung him upside down. He then took Kot's brother and placed his head on a block. All the while Kot's brother kept screaming. The butcher picked up a shiny object, raised his hand high and then brought it down swiftly. Kot saw his brother's head roll off. He then watched as the butcher cut his brother's legs, plucked off his wings, removed his innards and put him in a bag and give it to the man standing on the other side of the wall. Kot knew that it was his turn now. But the man on the other side signalled the butcher to stop. He had not expected to get so much meat from a single hen so he didn't want any more. So the butcher picked Kot and placed him back in his cage.

All his brothers and sisters asked him what he had seen and where their brother was. Kot could not speak for a while but then slowly told them what happened to all the hens. His siblings could not believe what they were hearing. They all started shouting at Kot. They blamed him for their fate. They said, "You spread lies and made us peck at the ground all the time. If we had not listened to you, we would have been at the farm with father and mother."

Soon the sun set and it was time to close the shop. The butcher placed all the cages inside the shop and brought the shutter down.

In the darkness, the hens grew even more scared. They fluttered their wings and tried desperately to move about but they couldn’t. They became even more angry at Kot and in rage one of his brothers pecked at him so hard that Kot began to bleed.

As he lay there losing blood, he realised that there could be one way in which he could set all his brother and sisters free. He said to them, "I know I have led you to this horrible fate. But if you listen to me one last time I assure you we can all be free."

The next morning when the butcher came to the shop, he saw blood running out from under the shutter. He opened the cage and found all the hens soaked in their own blood. They had pecked at one another until they all bled to death.

Kot and all his brothers and sisters were now truly free.

(The needle story I read long ago in Tinkle or some such place)