<human>: My girlfriend [20, New York] wants to move out of her house because it is an abusive home physically and emotionally. Due to this she has been paying for herself since the age of 15. ( phone, school, food, clothes, etc)

The mother hasn't given her a cent since she was 15, and all her mothers money goes to her sister. (Once a week the sister comes over and their mom gives her 500$ because she's 30 with no job with a baby on the way) 

Her grandmother owns an apartment building and gave the parents ownership of them. To later give to their daughters when they reach x age. Now she can move into the building at any time at the moment.

The problem is her mother is a raging drunk and loves to storm into her room to fight with her at her will. Can she do this because she's the landlord ( if we move into the apartment?) 

My girlfriend is not financially stable enough to afford another housing option, and she is getting to the point where living in that home is not an option. 

So my question is what rights does her mother have as a landlord, and if she does move into the apartment what is her mother legally and illegally able/not able to do?

Can you succinctly summarize the text in 1-3 sentences?
<bot>: girlfriends mother is the landlord, what rights does she have to her apartment in regards of going inside, or banging on the door at 2:00 in the morning?