You can enter her room and she's lying in her bed. If you enter the attic and look through the peephole she is masturbating. I know it's a trivial... But you can switch (fix days/random) between 'locked room/masturbation' and 'open room/lying on bed'
Who masturbates with a roommate standing in the doorway. Well... at least Jenny doesn't. But once her door is closed and knows you're not there, she might take things into her own hands.
