Thank you all, so very much, for you thoughtful and insightful replies. I have read them, and will re-read them now that a decision is made.

DD has been offered the chance to move to a different class and has decided to do so. I know the teacher well, she has several years experience, and she will be wonderful for DD. DD also has several very kind friends in the class, which will make a big difference for her.

I definitely felt wonderfully supported through reading all of your experiences and thoughts - from the 'non-answer' response to kid questions (perfect!) to the affirmation to take any bullying seriously - and I cannot tell you how appreciated that support is!