Most 14 y/o girls know what’s going on. The boys were either sharing a joint with her, or must have said “Let me show you my Selfies. The light is much better -OVER HERE!”
or it could have been as simple as “dare ya to come into the boys room, after all you can just say you were feeling like a guy today”...
The girl had to know something forbidden was going to happen.
Then again what do I know, as I’m an older man. Do mothers still educate and warn their daughters about what boys want to do with them, warn them about getting in trouble getting a bad reputation, any of that???