The victim is never at fault.
That being said, there's an important question to ask.
Why is is that the other women present that night were not attacked?
Is it because they traveled in pairs? Is it because they never left their drinks unattended?
It's often something like the person or one of their friends realizes that the world crashing down on them, so they get the fuck out of there ASAP and wake up the next morning having no idea how they got home.
Yeah, about that. That's a symptom of acute alcohol intoxication too. As far as I know, I have never been date raped but in my younger days, there were many nights that I don't remember how I got home.