Alright. So this is TOTALLY me. Except we did it at my best friends parents house when they were in Napa Valley for the weekend. This is how they handled it.

First, photograph EVERYTHING and collect everything. Every bag of weed, every cup, the vomit. Then collect and print out the pictures it all and put on the counter. Then get the little unclean bitch and her mother over and ask what happened.

When she walks in there will be a pile of evidence on the counter and she is going to get the worst feeling in her stomach and sweat and feel like shit.

Don't yell at her or bitch her out, just say that you trusted her and she screwed up. Tell her you'd like her to clean up her mess. Say that she probably didn't intend it to get that out of control or people to vomit but it did and you are holding her responsible. Ask her if she has any friends she wants to have over to help her. Tell her you will call them and get them to come over and help and it won't be on her head. Even if the house is clean, she can scrub the floors or something. And watch her. Stand there and watch her.

This is what my friends parents did to me, my friend, and two other of our friends and all of our parents. It was the worst punishment but we deserved it.

Kids will be kids, we partied, we didn't clean, there was vomit all over the guest bathroom, there was a tampon in the nightstand of her parents bedroom, we fucked up. And we got punished. The punishment fit the crime. It wasn't angry, it was just a lesson that we had to learn.

You definitely have to let her parents know. 4 years ago, I probably would've said "be cool" but no. If she gets away with this she won't learn. I had a party just last week at my bosses house and we got completely shitfaced. But that house was cleaner than when we got there. I mopped the floors, I cleaned the baseboards. I made sure everyone knew that I would kick their ass out in a heartbeat if there was a sprinkle of piss or vomit on the toilet bowl. Everyone I had over was respectful and even though we were shitfaced. They knew that the house we were raging in was going to be left spotless because I told them before they even walked in. I learned my lesson. She needs to too.

Last bit of advice, don't say things like "this could've happened, someone could've gotten alcohol poisoning and died," etc. I heard this so many times and although it may have been true, it will not sink in and she will most likely take less of the things you do say to heart.