I think she misunderstood feminism a bit with the whole free-the-nipple analogy (you don't have to be comfortable showing your nipples to be a feminist, just respect other people's decision to do so - which she seems to do).
I don't necessarily see her as a feminist icon anyways, and either way, it's her decision to identify as a feminist or not. REAL feminists would and should respect her decision to do so.
Bullying people into looking at the world from your POV never really works, and it never really will.