If Skeletons don’t have… meaty accessories… they can identify themselves as any gender?
Ok, i won’t push my funny bone any further. It’s very long you know? 
Now seriously, i assumed she is biologically female, and that her figurine just reflected a stronger draconic ancestry¹, so she wouldn’t have breasts by the artist concept.
I don’t see any problem if this is a diversity token character, the art is good (unlike some two other cards), for the event the troop is viable² and honestly it’s a fantasy world that mirrors many things that from our world and other pop-fantasy influences, past and present, so it’s just fair to have some more diversity.
¹ By the way @Sirrian, shouldn’t we eventually get some racial trait for “Great dragons” and also some versions for the other “Minor variants”?
² She could get a buff after the event ends so her spell would have a Damage boost of 2:1 instead of 3:1 to be slightly worse than High Paladin.