I do understand your hurt over this. my grandson lies about people also. I think it is something in them now days to lie. it is so very sad to know parents believe these lies. I would talk to her if she approaches you and do it in front of your son and dil and tell her how bad she hurt you. I do that to my grandson. it kind of shames them but not in a hurtful way. more to let them know that you know they are lying. have fun with the boys at the game!