How to deal with roommate's new girlfriend practically moving in?

Honestly, I don't really see where the issue lies other than that she doesn't want to be your friend; which I think is fine. She's jamie's gf and doesn't have to be your friend. If she is civil than I don't see an issue. Tell her specifically, what things she does to bother you( i.e. locking the door) and just deal with it.