To be fair, there's a decent amount of psychos in sororities, too. Sounds like she suffers from poor self-esteem and she gets an ego boost of looking like she is in a sorority and knowngly drinking in your letters. I hope she'll move out, but regardless, all future roommates need to know in advance that you look forward to being roommates, but using/wearing your sorority things are strictly offlimits. Be clear so there is no question on where you stand.
She sounds like a freak. You should go in her room and take the photos off her dresser and put them on yours. She can ask why you did that and you can say, "Well, I don't want to be in your family. I just want to look like I am..."
Roommate conflicts will occur for the rest of your life. Take the time now to learn to be assertive, b/c this silliness doesn't end when you graduate, have professionals as roommates or even a husband and kids as roommates. Take a stand and lay down rules.
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