I orginally posted this in the wrong section...

I have an elderly tenant that lives alone and doesn't speak English. She's a good tenant, keeps to herself and always pays me on time. When I bought the house about a year ago, she was only paying $400 a month rent. Her apt was in need of a lot of work so I didn't feel as though I could I raise her rent without fixing up the apt. I've finished her apt in April and gave her notice on May 1st, that her rent will increase on 7/1. I went to collect my rent today and found boxes full of stuff in the hallway outside her apt. On the side of the house was furniture, a couch, table and chairs, a hutch and misc. householed items. All but one of the blinds were closed and when I peaked in, all the pictures were removed from her walls and there were a bunch of boxes piled up against a wall. I knocked and got no answer. I tried my key but the lock has been changed. Her son lives upstairs but he's bum, a gifted liar and since I'm in the process of evicting him, I don't expect he'll tell me the truth. I called him but got no answer. I knocked on his door and again, no answer, though I believe he was home. How can I find out if she moved? I do know that she was anticipating a rent increase months ago and applied for housing or a housing subsidy. The city housing dept contacted me back in March or April for some information. I'm assuming, if she moved, it was to city housing. If I contact them, will they tell me? Since I recently rented another apt in the building, I have a list of people interested and could easily have the apt rented within the week. What are my next steps? I don't want to enter the apt illegally.