Is there no way you can find out what you may have said/done (and if it was you who said/did anything) from the friends you were with?
Have you checked your phone in case you made any calls or texts while you were so drunk?
Otherwise maybe a text (or handwritten letter to show more effort) to say you don't know what happened and assume it was while you were extremely drunk etc... but that you are really worried as she won't respond and if it is anything you have done then could you meet to talk about it at least.



