Is Her Roommate Evil?-OPP

A woman suspects that her roommate is terrorizing her. She is having trouble proving it and her family won't believe her.

Mike & Kate-
I have a problem with my roommate. She is evil. The only problem is I can't prove it. We have lived together for 3 years now. We have a hostile relationship. We've never been friends that hang out but we got along as roommates in the beginning. Then she got hostile. We got into a fight over her using all my laundry detergent and things have never been the same. That was a year and half ago. The house we live in is owned by my aunt and we each have our own lease. So if one moves out the other's rent won't be affected.
I suspect that she is still my mail. I order things online and it would say that it had been delivered to my house but I never saw a package. This went on for a few months. It didn't happen every time so it took me a while to realize it was her. I started having my mail delivered to my work. Other things will go missing as well. My clothes, my hairbrush, a bottle of conditioner, my dog's food. Someone put Nair in my shampoo bottle. Good thing, I realized it didn't smell right before I put it on. My plants in my room end up dead. Someone put used kitty litter in my car that was in the garage. It's always random and when I ask her about it she completely denies it. She is so passive/aggressive. I've even gone as far to as to set up a camera in the kitchen but have never caught her doing anything.
I feel like I'm going insane because she is so nasty to me and so nice to everyone else. My family can't understand why I don't like her. The worst part is she has started dating my cousin. They met when he would come over and fix stuff for his mom. They've only been seeing each other for about 3 months, but the family loves her. I think she is slowly sabotaging me. And since it's my aunt's house, I think she should move out. Plus my lease isn't up until January. I've failed at getting any video proof. How can I show my family that she is not as sweet as she plays it. I feel like I'm going insane!

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