Woman Kicks Her Roommate Out After She Finds That She Had Been Stealing From Her
This AITA story might have the easiest answer of them all. In no way are you in the wrong if you evict someone from your house for stealing from you. That's, like, the most normal and logical thing that you could possibly do given the circumstances. Yeah, it sucks that they are a friend of a friend and this could cause discord in that relationship... but if they have any shred of decency they would realize that maybe they shouldn't be friends with that person either.
The person who commented that the poster should go through the proper channels to legally remove this unwanted guest gave some properly solid advice. Best to keep them out and away in all possible ways.