Just go in her room and collect your stuff. Tell her that you did that and make it clear to her that she is not to "borrow" it again.
Conversation should go something like this:
You: Just so you know I went into your room and got all my stuff back.
Her: Why?
You: Becuase it's my stuff and I want it back.
Her: But you said I could borrow it.
You: I changed my mind.
Her: Well, can I at least use your glass for the house party?
You: No, and you can't wear my shirts. You're not an ADPi, therefore you can't wear my letters. So do not go in my room again or take anything that is mine.
Then... stand by what you say, if she continues to steal your stuff, talk to your RA (I assume you live on campus).
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