She can emphasize her racial variances all day, but society gives fuck all about how she views herself. If a racist white person identifies her blackness and decides not to hire her or give her a loan, or arrest her or whatever, they don't care about that. It's not self-chosen. You are treated how you are perceived. If she lives in a micro-society where fairness gives her more agency, then she may find some agency, but remove her from that situation and the choice won't be hers.