Always focus on your business first. Whatever went on with you and the girl, you need to make sure your rental house for next year is squared away. You need to very clearly and to-the-point ask her if she's still going to stay there because if not you need to know so you can secure another renter. This might trigger her to feel unimportant and replaceable, but it's just business. Your college career is more important than anything. If she gets emotional you just stay calm and stay on topic. If you and her want to talk about the other situation that's cool but you have to put your business first. She sounds kinda flaky honestly to me, and you really weren't even into her to begin with.