Originally Posted by ScottGem
While this seems unfair, the landlord has no legal relationship to you. Your mom is her tenant, not you. You have no formal agreement with your mom. Therefore, your mom has the right to change the locks on the apartment.
Your beef is with your mom. But there is obviously something more going on here that you are not telling us. I suspect the reason the apt is in mom's name was because you were too young at the time it was rented. What I don't understand is why the drastic reaction. That's why I feel there has to be more going on here. From what you have told us, I see no reason for such drastic action.
I think you need to tell us the whole story.