She called out the school and charged it with being racially biased. People are free to agree or disagree with her goals, but she took an adversarial position and made statements that were meant to draw attention to the school in a negative way. Again, agree or disagree, that becomes part of the conversation when you look at who to hire. And I can't imagine many scenarios where an employer would want to hire someone who had shown such a tendency.
While I've never seen any other statement from her after the fact, I also can't really imagine her wanting to come back, either. It felt at the time like a "and one last thing" sort of remark on her way out. The kind of thing you say when you don't care any more about what happens afterward. At least, that's what it felt like at the time.