To be honest I’d just avoid her. The only way to end racism is making people see why it is offensive and teaching them. But if they arent willing to tune in to what you have to say and only stir up more drama then cut them off. It’s not worth it. Theyre entitled to their opinions like you are to yours. And depending on your situation id have a serious talk with your partner as well just so theres no misunderstandings about what makes you uncomfortable or them uncomfortable etc.