<human>: Hello r/relationships!

My [20F] roommates [22F/19F] and I are having a strange problem with our fourth roommate [F21], lets call her Katie.

In our living room when we moved in about six months ago there was a flat screen TV our landlord had given us. Our apartment came furnished and this was a part of it. All of us except Katie went home for the summer and since we were gone she took the TV into her own room and put it above her fireplace mantle. 

It has been there the past few months and has become a point of contention for us. Our landlord has been useless and keeps telling us to work it out between us. We had a big meeting about chores and talked about moving the screen back into the common space where it belongs.

Upon mentioning this she had a full breakdown, tears and all, and kept saying how TV don't belong on glass tables (where it had been pre-move in). She insists on buying a shelf to put it there but it seems very fake and she still hasn't ordered one, refusing to move it in the mean time.

She always said we could go in her room whenever we wanted to use it but us three feel this completely misses the point, not to mention she has instead decided to leave on a "mental health trip", mid semester of college and bought a padlock for her door to keep us out saying that she feared for her safety from us and what we "might do". 

We have never done anything to make her feel unsafe in the apartment, aside from expressing how frustrated we are about this TV thing. Her boyfriend refuses to come open the room and the screen is pretty much being held hostage from us.

We can unscrew the lock from the wall and get in but I seems like there are some legal issues with this.

Can you condense the text into a few key points?
<bot>: Roommate moved shared television into her room and left on an extended trip with a new padlock on her door to keep us out and locking the TV inside.