I feel for you!! I have a daughter who is a high school freshman and she has a 96 overall average so far. Her teachers love her and send home great reviews in her report card. So I understand!! If one of my daughter’s teachers randomly turned on her did this I would feel livid, helpless, and worried for her class rank, so I am empathizing that your state of mind is similar. I would be FURIOUS too!!
Unfortunately, this is life, and these things actually happen. It’s the worst part of being a parent, when something grossly unfair happens to our child and we are powerless to change it.
The best advice that I can think of is to get her switched out of the class. If a bad chmenistry has occurred, and it sounds at if it’s the teacher’s fault, there is little to be done, and you don’t want to have to go through the rest of the year like that. Unless, your daughter would then be in classes all day with no one in her circle of friends, which is very hard on a high school age girl. In that case, keep track of everything...
Good luck!! In the big picture this is good training for college, because this type of scenario is almost certain to occur somewhere along the way.
sorry - meant a bad chemistry (between the teacher and the daughter)