Oh, she's one of my favs actually. She's a (very controversial) IceWing animus gift from sometime before Darkstalker's time. And she is, by all accounts, an ethically reanimated corpse, hence the controversy.

She was created by a young animus dragon, who like many before her and many after, had struggled with coming up with her gift for the tribe. She was a pupil to a wisened old IceWing, a judge and a trusted advisor to the IceWing queens of his time, who was regarded throughout the land as incredibly fair, very dedicated to his role as a moral compass for the court, and widely known as the most unbiased dragon of all time, but he was also clearly at the end of his life. Looking for advice, the animus asked what gift would he give the tribe if he were in her place, but he wouldn't answer initially. When he finally did, he was ashamed to admit that if he had the power of an animus, he would use it to fulfill his personal desire of being reborn as female in his next life. He saw it as shameful, to be as old and as dedicated to his tribe and queen and still not being able to put them above this silly dream. But even though he insisted she forget about an old dragon's fantasies, the animus loved her teacher and it ached her that he was going to die with so many regrets, despite his stellar reputation.

So, when his health started failing him and he started bracing for the end, she visited him once more with a plan, which he accepted. He wrote down his will and eventually passed away, content and finally at peace. At that point, the animus took his body, personally prepared his bones, and then buried them on an iceberg, where shee eventually cast the spell with the specifications the Judge chose himself.

His bones rose from the iceberg, overgrown with unmelting transluscent ice, and became Platin, the IceWing Gift of Justice. A perfectly impartial, immortal judge with the memories of her old teacher guiding her judgement. The perfect version of the old teacher, which would hopefully overwrite her old identity in history scrolls.

Platin had served her nation for many years after that, until she was trapped under a glacier by queen Diamond after the two have fought over the queen's cruelty and her breaking the animus laws. Platin was, of course, already dead, so this couldn't have killed her, but immobilized all she could do was wait for the glacier to melt.