She has said repeatedly that she won't, and I am inclined to believe her. If she were to run, we would see a firestorm of "Oreo" and "House n*****" and "Aunt Jemima" like you wouldn't believe from the "tolerant," "anti-racist" left. I can't blame her for not wanting to subject herself to that.
Not that it wouldn't roxxor my soxxorz if she did run, though.