Tell her that she needs to come pick her stuff up. Give her a day and a time and tell her if she's not there to pick it up on that day at that time, then you will start sticking her stuff out on the sidewalk with a sign on it that says 'Free'. Then keep your word on it. That's what I would do, and it should definitely motivate her to come pick it up. She's playing games, don't let it get the best of you.