what would you do if your child's nude pic was passed on the internet?

I would seek help from the authority. And be guided on what to do with the stalker. I would talk to my daughter, and tell her to be responsible enough in everything she does. Especially if the effect is as serious as this.

Press charges against the person who started this, and find out if there was a way of pressing charges against anyone else who passed the pictures on since tracking them may be hard to do. Then it is time to talk to the child, and to also consider seeking counseling, the emotional turmoil of this incident would indicate that family counselling would be needed. I would want to know how it is possible that the pics of my child had been taken, what circumstances caused this to be happening in our lives. Then get the best help for my child and other family members possible. I would also consider getting in touch of the parents of my child's friends asking if they would be willing to talk to me about what was happening, so that open honest discussions could happen with thier children in a way that would hopefully bring a healing to my child and her friends. It sounds like you have real concern for this girl and her parents, congrats on not immediately judging her or them and assuming that they obviously did something wrong because it is very likely they didn't do something wrong. But as most parents know you can not watch or protect you children 24/7 you can only do the best you can, and make a real effort to do so. If it happend to the friend of one of my children as in your case then I would hope to talk to my child about it in a way that would cause her to feel compassion for her friend rather than judge or alienate her. I would hope that my child would be willing to talk her friend and her friends parents so that we can learn how to protect all of the children better and perhaps offer friendship and support.