The accuser states she remembers this from a repressed memory. Repressed memories are extremely imperfect, at best. For instance, alien abduction cases and the McMartin Pre-School case are examples. The accuser can't remember where the party took place, nor when.
Next year, if Feinstein is e-elected, she should be denied any committee positions as she is unreliable, at best. She sat on this information since July and said nothing until days before the Judiciary Committee's scheduled vote. She is also on the Intelligence Committee, while employing a Chinese spy on her personal staff for 20 years.
BTW, anyone notice Old Salt's source -- the Onion?