Hello Annette321 and welcome.

Biggest thing I can tell you is your mental well-being and physical health are your priority. Don't do like me and run yourself into the ground and end up with serious illness. If your mom draws you into word salad and you sense that mood being there, they excuse yourself from the situation.
I hope you were able to completely heal from your illness, Annette.
I moved in with my elderly parents about 6 years ago after spending my all my adult life NC, VLC, or LC due to my dBPD mother. I sabotaged my mental health...and a social life and an sense of self. We all know the rage and humiliation our mothers dish out to us. It truly has a lasting adverse effect.
My mother ended up dying two years into reconnecting after being no contact for 4 years. She did die in peace and she did give me peace (amazingly) when she passed. I felt good that I could be there for her and felt good that it peace-giving, loving. I had closure.
I'm sorry about her passing. I'm glad you both were able to experience a sense of peace. I'm happy you had closure.
BUT after they die it's another hurdle of dealing with the mixed emotions, flash backs and healing.
Others with bpd parents who have passed away have posted about this too. My mom is still alive but I had an unfortunate long-term marriage. My ex-husband was very abusive and I ended the marriage. I didn't like him or love him. I was very sorry I married him. He died and I went through a long, painful grieving period. I was taken aback. You don't expect to grieve someone you didn't care for and never wanted to see again.
The only good from that is knowing this will happen when my mother passes away. I'm preparing myself.