Honestly, there is nothing you can do unless they were foolish about the paperwork you signed when you registered her for the daycare. I have been down this road before. If you threaten any kind of legal action, they will immediately expel her from the daycare and there is absolutely nothing you can do about it. Also, this sort of thing happening in a pre-school is not as uncommon as you may think. That doesn't mean I wouldn't pull my kid out if it happened too often though. It also doesn't mean that I wouldn't ask to meet with the director to make him/her aware of what happened.