I wanted to give an update on this situation. I realized the mother of the girl didn't come to my house with peaceful intentions - I think she was secretly mad that I told the school and would rather have solved this secretly. I reassured her this would blow over. There were only 2 other girls who knew about this - a girl who saw her do it and my daughter told her best friend because sometimes this girl goes to her house - my daughter was worried the girl might do this to her.

Since my daughter told another girl, they didn't like this and decided to exclude my daughter from her birthday party - punishment by alienation. I saw the mother at a cross country race and ask her about this - and she claims her daughter felt humiliated by my daughter telling this other girl. I just responded by saying I would ask my daughter. I wish I would have said - "if your daughter didn't do this in the 1st place maybe she wouldn't have to feel humiliated. I feel it's the typical 'blaming the victim' and sweeping it under the carpet. I feel so crappy about this situation now.