S.C.
I have put two sons through high school and experienced this problem with one of them. He said he didn't like the teacher for various reasons but we explained to him that it didn't matter, he still had to do his best in the class and wait it out. Sometimes kids will want to switch classes because they don't like a teacher, it isn't a good idea for that reason alone. We all know from experience that we have to work and deal with people we may not like or get along with but will have no choice in the matter. It's a good life lesson to teach her to adjust to these situations or better yet address the reason why she doesn't like the teacher and try to change that. Learning to forge good relationships is the hardest but wisest thing we will ever do.
S.