My neighbor is going thru it

My neighbor (24F) & her son(8) moved next door to me a few months ago. For the first 3months it was just her and her son. She’s bubbly/friendly & a girly girl. She is sweet but I could tell that she’s a a little “delayed” & Idk how her family let her come to a new state alone. I would give her rides but I don’t really know her.

Her bf moved in after 3months & his car has plates from her home state so I’m guessing he knew her before hand. He’s weird & I can give so many examples why. His first day there he left aggressive notes at everyone’s door saying not to park in his assigned spot or he’d call the cops…she didn’t have a car and still no one parked in that spot for 3months so it was rude and unnecessary. She’s in the section 8 unit so technically he’s not even supposed to be there. I initially thought he was her gay bestie or relative.

He’s an unemployed, drunk and stressed out. Every night at exactly midnight he starts yelling and fighting on her. Her appearance has changed & she looks terrible. She stopped wearing wigs and makeup & she doesn’t comb her hair at all. They went to church last week and him and her son were dressed but she looked like she just rolled out of bed and left. She walks in the back with her head down and she ignores me when I speak to her now. She’s never ever alone, they even take out the trash together.

I’m starting to feel worried but what can I even do? Neighbors have called the cops before and nothing came from it. Our landlords are cousins and I could tell my landlord but I don’t wanna risk her getting kicked out/losing her s8. I just feel so bad for her but idk if she even wants to leave.