a weird (maybe?) hypothesis:

Is it possible Squi set her up? Brought her to the house as a party favor for his pals, she had no idea, just boys playing pranks amongst themselves and they see the girl as an object they don’t even think about? Gave her a beer, maybe with something extra in it…

I got to thinking about this after being reminded about one of the subplots in Sixteen Candles, where a guy (the hero!) did something like that to a girl he’d grown bored with… and realizing that if this guy she used to go out with was downstairs, and she’s not sure how she got home…

(which, y’know, doesn’t at all excuse that Kavenaugh and Judge were apparently so drunk they have no memory of the event, or it was so routine they forgot about it ages ago, and that conspiracy rant in his prepared remarks was OMG so not impartial or judicial temperament…)