I think she is unsuitable because she doesn't care what the Constitution says, nor what is fair, or even what the law is. She sees her duty to promote her agenda of racial preference and give deference to anyone or anything that is not male and white.
She is clearly the Dumbycrat version of the best, most qualified person for the Supreme Court. But I doubt that she is any worse than Ginzburg, or the other radical leftists on the court.