And I love that they had included this "super creepy" aspects to your decisions; making you think you handed a girl off to a rapist.
BUT
If you talk to her during the party and mess with her talking options enough, you'll find one telling her to go down to the basemant. She will oblige and even say "Oh, [Forgot his name] is here!" and will willingly head down to see him.
Once I found this option I was sad because it ruined the depth of the creepiness...