Do you have a shred of evidence that that is what happened? That they had any interaction?
The fact is, two bystanders happened by and were witnesses. She was completely unconscious when the two bystanders, that didn't know any of them, happened by the scene.
Yes, the police reports police plenty of indication that they were at the party together.
The courts have now released 470 pages of documents.
Interesting reading.
http://paloaltoonline.com/media/reports/1465602928.pdf