My friend always wants to come over my house, but she always trashes my room!?

Like last time. She left her clothes in a pile on my floor, at 12 am. i woke up and saw her totally RUMMAGING through my closet. I said what are you doing and she ran into my bed and pretended she didnt know what i was talking about.. She left her dinner/breakfast/lunch plates in my room. Then 2 hours before she had to leave, i told her to clean her stuff up otherwise she is never sleeping over again. She was totally annoyed at me for a week, but now two weeks later she wants to sleep over again.. What should i say to her, because i dont want her at my house