My Nmom is mad at me...for her buying a house.

I'll try to hit the meat and potatoes of this story so I don't enrage everyone with the details of my mom and her awful behavior. Here we go...

My nmom recently bought a home for the first time. We grew up in poverty so this was a big deal for her. I was weary as right now does not seem stable for such a purchase and due to her low pay and retirement pending next year ( but according to her...what the fuck do I know?). She has been bothering me for weeks to come get my key to "my future home". I repeatedly tell her I don't want a key as that is not my home and I have no connection to it. I also know if something goes wrong I will be the first one blamed since I have a key.

She starts gripping about how "she bought this house so I can always come back when I need her. It's going to be my home and I need to be involved". She has mentioned that over and over for days now and how she needs me to take responsibility as in her mind I "made" her buy that house under her own delusion it would fix our strained relationship. For reference, I have financially supported myself since I was 16 and have lived on my own since 19. She also knows I have no intention of ever living with her again (as I have a whole ass fiancé, degree and career) and have been making steps to move abroad.

I've tried multiple times to go NC, but something like a true emergency always happens or she plays the biggest crying pity party.

TLDR: My mother bought a house, but herself in a bad financial situation due to her own selfishness and somehow... that's my fault.