I am SO grossed out, how do i get out of this lease?! help please!?

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I posted a question earlier about what to do with my psycho roommate. Long story short, she's lived here since Feb 14th and has only paid me $23 in bills because she said she's "poor." However, she still buys new nike shoes and weed. There is nothing in my contract about paying utilities equally, and she continues to pay rent so the landlord is letting her stay.

She's been stealing all of my roommates stuff and lied about it when confronted. She's stolen/still stealing: our food, a north face, 2 ralph lauren sweaters, beverages, cleaning supplies, and toothpaste..on top of all that, I discovered she stole my UNDERWEAR. Used might I add..because I put my used clothes in the hallway and my door is always locked so she's never able to be in there. On top of all of that, she stole my friend's very personalized blanket and posted it on instagram. It's a blanket with her and her horse on the front. This blanket has never left my roommate's room, meaning she walked in and searched through her things to find it.

SHE STOLE MY UNDERWEAR...I am so disgusted right now. I really don't know what to do! By law, can the landlord do anything?

I also think she keyed my car. There are a BUNCH of new scratches that aren't where normal car scratches occur, like on top of my trunk, etc.

Any help would be wonderful, this stress is seriously affecting my health (I have hyperthyroidism which can worsen and lead to serious side effects if very stressed).

Any suggestions?? thanks!