Just wait until you calm down.
Talk to "23" about what happened. She tried to protect you. She obviously still likes you.
I really don't think there's a lot else to say about this to be completely honest. Some peoples kid's are crazy.
THIS. So much.
For realsies, YOU were the one who was attacked. If 23 judges you after you were just unexpectedly assaulted then she probably wasn't worth your time anyway. From the looks of it you could probably even talk about everything you posted in this thread to her. She seems like a nice girl. Don't be apprehensive, or you might lose a really good opportunity to make a great friend or even more than that.