Reach

Hmm, earlier on in this thread, I suggested: I missed the fact that dragons are gender neutral. Every reference I can find indicates that Viserion is male, but supposing he/she is gender neutral, then the woman may very well be Viserion. I think I like that theory best of all. Well, except that we all know that Viserion will be Tyrion's dragon... Maybe it's Rhaegal? But then maybe white fire doesn't fit?

It doesn't have to be a literal woman. It could just be a representation of something else, such as the Others, a faction, the magic itself, or even a dragon (although I guess Dany's dragons are all male)...