If I were the girl's parents I would hug her for a long time and made sure she knew she did a great thing.
If I was the parent of th girl that called her, the one who 'couldn't drive' I'd also hug my daughter for choosing the right choice. Doesn't mean she wouldn't be punished, Id just be grateful she was still around to be punished.
It's the parents of the girl whose life she saved that should be doing the hugging. And anyone who was on the street that night whose life was also saved by keeping a drunk teen off the streets needs to do a little "hugging" of their own.