I think it's her Kai art, just like how the 7thDesDiv got different Kai art from their base form.
Well, she has better facial expression than her pre-Kai, that's for sure.
Still don't understand why her ponytail is so thin when you look at her hair down damaged CG (but it's hard to tell if it's long haired actually), unless she is short haired and only a little part of her hair is long.