Well, she usually walks shows such as DKNY, etc in NYFW and her absence from shows she's booked every season she's walked makes me think that maybe she got the chance to do something relatively big at a last minute notice (She is turning 17 soon so maybe she's shooting something with VS? I know she said that she really wants to work with them...)
That's my guess but I guess I won't know for sure until Marc Jacobs has his shows (he seems to like her) as well as ODLR (again, they seem to like her).