Having a problem at my job.?

I'm a preschool teacher, and I'm now hoving an issue with one of the parents. For you to understand you have to know the whole srory. Me and her used to be friend. We hung out ALL the time. She then started some mess with me and another parent. Well me and the other parent worked it out. I havent spoke to the parent that caused the drame since June. So now everyday since she's claiming that her son is going home saying that I called them Crazy. Her son is not even in my class and I dont see him for about 30 minutes out of a day. We now have a meeting on Friday. How should I handle the situation? I would love to curse her out, but she wants a reaction from me and I refuse to do it. So any suggestions on what to do?