It is her friend who is calling 911.
The story is what we have already heard. The accuser thinks she was hit on the head, she was blacking out and doesn’t remember who she slept with.
That has been the main problems with the accuser’s story. The fact she wasn’t legally drunk, no drugs were in her system, she didn’t have a head injury and by her own admittance that she doesn’t exactly remember what happened. Very difficult to try to prosecute someone for rape if that is all you have to go on.