Wouldn't she have called or texted in real time to say she was sleeping those drinks off in her van? I unfortunately don't think you're getting anything approaching transparency.
I agree and those are the points I keep bringing up with her. I've only been asking her lately to let me know if she is being held up or if there are other things she still needs to do. Just keep me in the loop...she does this part of the time, but obviously not that night. Her Mom was blowing up her text while I was mostly quiet (avoiding the controlling label). She wasn't even responding to her own Mom which is very uncharacteristic. She is literally flying solo and her parents are showing the same concerns as I. She WILL crash and burn at some point and will find very few people will be there to pick her up. Literally her Mom, Dad, and I are the only ones truly close to her but she is ignoring all of us for the most part and just doing her thing....full on rebellion.