I would personally confront the teacher and the principal. There is no reason to mention Hitler numerous times during a freshman English class. She is obviously trying to get a reaction out of your girls. I would meet with her and confront her about the hitler thing, the grades and the article. Have the principal or vice principal there while you are stating your case so you have a witness. There is no reason to pull your daughters out of school for one teachers actions. I would bet you have allot of people around you who are very sympathetic to your views. You have the privilege of being in a 98% White area, you have the power to make her conform or just get off your daughters back. Good luck!