Real nice of her friend to leave your friend alone in a situation where the girl was left with virtual strangers.
As for the guy that she had sex with supposedly liking her, I doubt he's going to want to have to do anything with her now. If he did like her he would not have had sex with a passed out girl. Instead he would have directed designated drive guy take her home and not his place.
Depending upon how much time has passed, it's probably too late to have any rape kit testing done. She should take herself to Student Health or Planned Parenthood to get checked out as well as get counseling. Since she doesn't remember what happened and with whom, there's the possibility of STD's and pregnancy. Could there also be a workup to see if the date rape drug is in her system?