Something is her childhood and/or adolescence was screwed up. She was led by someone (parents? teachers? preachers? friends?) to so much identify with the victimhood of the blacks adopted into her family of origin that for psychological self-defense, and/or to get attention, to show she cared, she eventually started speaking of herself as if she was one of them. Children of Holocaust survivors have been known to think that their parents’ experiences of persecution were their own. In a sense they were, because of the psychological impact the parents’ past experiences have on their children born later. Their story was perceived to be bigger than life. This young woman’s “measly” life became identified as undesirable, as being the same color as the bad guys, the perceived “oppressors.” She decided to exit stage Left into the world where Blacks lived. There she could continue to be angry all the time, but now gain friends, appear to herself as noble, and get applauded for doing so. The other theory is of course possible - that she is just a calculating, completely aware, pathological liar and opportunist. I wager than her childhood with Black siblings adopted by her parents plays the major role in her life choices - applying to a traditionally all black college shows that her mental state was already set by the age of 18. She wanted a life among Blacks, as she had had growing up.
I think the fact that her parents adopted four black kids that maybe she was jealous because she thought they got more attention because they were black.