Who told you about the party? When were you told? Were you invited or did you crash the party? Did you go alone or with friends? Who were the friends? Did you walk or drive to the party? Did you tell your parents you were going to the party? Did you drink before you left for the party or on your way there? Who did you hang out with at the party, boys or girls? Who did you talk to and what did you talk about? After the alleged attempted rape, did you tell anyone about the alleged rape? If not why not? Did you leave immediately? Did you leave alone or with friends? What did you talk about with your friends on your way home?
Ask her about everything from the moment she heard about the party until the day she testifies.
To add to your questions.
Obviously it was a large house with many bathrooms. Why did you choose to go all the way upstairs and pass through a bedroom to get to a bathroom when there were plenty of other bathrooms?