Oh JEEZ!! Been ther done that!!! Girls can be HORRIBLE!
Our daughter put us through the ringer starting when she was 12!
First , I would not allow her access to the computer at all! If she refuses to adhere to the rules then she shouldn't be able to use it. The internet is much too dangerous to not be adament about it's uses.
If she goes to a friends house, get on the phone and tlak to the parent. Tell them your rules and that you expect them to adhere to them as well. If it continues, then she doesn't go to that friends house,, period!
You need to let her know that you are serious about the rules. This age IS very trying and she will test you and push you every chance she gets. It's exhausting and tons of work, BUT, it will be worth it when she remains safe and alive.
Our daughter pushed us to the limit but I was a force not to be reckined with. She pushed me,, I push back twice as hard.
That's my job as a parent. Again, it was EXHAUSTING and I didn't think I'd live through it,, but I did.
Tell he to put on Fox news and listen to the story of a missing girl who met up with the person she met on line. She is now missing,,, her clothes were found but no person. What you think happened to her? HHMM? It happens everyday, and if you have to duct tape her to her bedroom door to keep her safe,, then guess what, you'll buy stock in the tape company to ensure her safety :)
It's tough,, but you HAVE to keep one step ahead of her, make phone calls to where she will be visiting, stay in contact with ALL the parents of her friends, let them know your rules so that they will hopefully be applied while she is over there.
P.