This is one really sick perp (regardless of age)
I bet if you were to interview the girls involved with the sleep over you will find out that she was only invited to be a victim for everyone there. I also bet that this is not the first time this girl was victimized by this click of girls...
boiling water is not a prank. my bet is that the girl that’s house this is at and did the pouring is just a follower and the real culprit the one directing all of this was a one of the guest kids at the sleep over.