She is prey to this pedophile. And, yes, she is in danger. You are right on about his intensions and she is just a foolish school girl playing penis roulette. I actually feel sorry for her that she is so desperate that she will meet a stranger who has manipulated her into drinking so he can have his way with her. What a pity that she thinks so little of herself that she even allows herself to be used that way. But, she is desperate and desperate girls do desperate things, all day long.
Personally, I would tell her parents. She is going to be some pissed off at you, but you could very well be saving not only her life, but from a handful of other problems (pregnancy, infections, STD's, emotional upheaval and such). She clearly does not know or fully understand what she is doing because if she really did, she would not be putting herself in a position to be with a stranger in a hotel room.
I had to laugh about her protecting herself. Yeah, right, how does a drunken passed out chick control who comes into the room and has sex with her rag doll body?