I guarantee you that your 15 year old son (and all of his friends)? have seen her pictures on facebook.
You have to wonder that when she arrives home, very drunk wearing only her thong panties and a tank top....is she practicing safe sex???? or doesn't remember???? (that is a whole different nightmare)
I'm sure you and your husband have given her the "don't you have any self-respect" speech.... but the truth is....her actions are giving the impression that she is willing be treated a certain way by most men...no matter how smart she is, no one will respect her. And this is going to impact her future relationships both with men and women. no one will take her seriously when/if she is ready to be a responsible woman.
right now she is very immature emotionally and displays addictive behavior.You have to step in with a tougher stance and some help....you cannot be a friend she asks for wine...you have to be a Mother with a capitol M.