don't want to be racial. But black people is hard to work with

especially if you are in a technical field. if in marketing, they are very good.

If you have documented what you did to correct her mistakes, I think you can have her and your boss sitting down together to make sure she listens. Black people know whose aXX to kiss. So this would be effective. But you will be on bad terms with her forever. Black people also have very good memories like elephant. But at least you let your boss be aware of issues and he would not be biased if she complains about you in the future. That is, your boss is neutral and fair.