I say tell the teacher. Yes, someone may have hit her or hurt her, but I really don't want to teach her that hitting is okay. It's like spanking a child for hitting you-it makes no sense at all. Children should be disciplined for hitting in another way than physical punishment.
Dh, however, doesn't just say hit back. He says "punch in the face and kick 'em in the shin"
I DO tell her she can defend herself. By moving away and telling an adult who can discipline that child properly. Dh says I will raise a wimp; I say I won't raise a bully.
Can you tell we have some issues of conflict in parenting?