Yeah, when I said "party event" above, I meant that I finished all of those events, but still didn't get that option.
Yep, tried tried that as well. I have read somewhere that her roommate shouldn't be in the room, so I was paying attention to that. Thanks for trying to help :) Someone said you might need to be at a certain level of exhibition (he wasn't sure). Do you remember what was your exhibition level at the time?
Since I have started to go into detail I also should mention that I actually got that option only once, long before any party event, but never got it again after that.