Have you just asked brick to stage the kidnapping, or have you already "rescued" her?
If you haven't rescued her, be at the university entrance on Wednesday at 19:00 (IIRC, i haven't played in a couple months).
If you already rescued her, to ask her to the movies, you should just have to build relationship points with her, by talking/gifting at the university. She should be in the hall at 17:00-19:00. Once you have enough relationship points, there should be an option to ask her to the movies.
Getting into her house requires a high enough relationship/depravity, which after a movie date she'll make out with you in front of her house, which should open up the next stage.