Dude: This young woman sought help immediately.   That alone gives her a lot of credibility.  This is not another one of those cases where a woman makes accusations weeks or months later, and it is then way too late to gather any medical evidence.

These cases are indeed difficult to prosecute, however, due to the alcohol factor.   If a woman has drunken herself into an alcoholic daze, to the point where she cannot remember exactly what happened, and only has vague, unclear memories of events, that then harms any testimony that she may be able to give.