Gee maybe the guy(s) who killed her?? Every young person does something stupid at some time (with the exception of YOU?) There are predators out there just waiting/stalking for a stupid event. Sometimes they get "lucky" - sometimes they don't.
The thing is, if you do something stupid, sometimes you get hurt or even killed while doing it. It was just plain stupid to get into a car with three strange men. Yes, they did the killing--but she made it easier by getting into the car.
you answer your own question that's why you don't get in cars with STRANGERS!!! what's so hard to figure out???
i raised 1 boy and three girls and taught all of them to NEVER get in a car with strangers...