Teenage girls with no supervision, underage drinking, exchanging phone numbers with strange men, visits to unchaperoned boys' hotel rooms... why would it be so shocking that something bad would come of this???
I doubt the chaperone was any more responsible or strict at home, so why would anyone send their kids with her???
So many questions...
"...exchanging phone numbers with strange men...."
Yes, this part is very bad. And this girl broke the #1 rule for partying girls: don't leave your girlfriend(s). They probably were all so blitzed the boys didn't realize she had fallen. Her friends should have insisted she re-join them when she called at 1:30.
I feel very bad for all these people, but I gotta tell you, you watch other people's children even more closely than your own.