My question involves an eviction in the state of: ny
My mother has missed one month of rent and also just gave the lanlord a letter stating she will move out the last day of April. Since she has not paid for the month of march the lanlord warned her if march is not paid he will change the locks. My mother also does not want to pay April but is willing to give him the deposit for 975 (rent is 750). My mother has lived there for 11 years and with her own money replaced all the windows except 1 in the bathroom and 1 in the kitchen she has also replaced the kitchen cabinets and kitchen flooring. Reason for her changing everything is because lanlord refused to change everything. Floors were falling apart, cabinets were falling apart and windows were old broken and she was afraid for her safety when it came to robberies in the area she lives in. It is a neighborhood watch area.
But my question is does he have the right to change the locks after missing one month of rent a no giving him a letter stating she is moving at the end of April?
Also no eviction letter was sent to her or a court date was issued in that county.

