So I moved to NYC with my friend about 9 months ago, we have an apartment together that we rented and moved into with this other girl we had never met before. She was super nice but she's barely ever home (literally, in 9 months she's slept here maybe 4 weeks total). Anyways, her last check bounced and we haven't seen her for four weeks, she's overdue on this month's rent already. I just learned from my landlord that she isn't on the lease (SURPRISE, I thought she was but we weren't together when we signed it).
Any idea on what actions I can take? Can we change the locks and hold her stuff hostage for the money?