My mother has borderline personality disorder and it is getting worse with age, is this common?

I sympathize because my mother is also Borderline. I moved 3000 miles away from her and I set very firm boundaries. I never visit her, do not allow her to drive with me in the car and only allow her to visit me if she will stay at a hotel. She once wanted to visit so I told her she could come for a weekend. She said ok, then she booked her trip for 10 days and said she was going to drive to the state next door to visit other relatives btu every day I came home from work and she was just still at my house.... she just didn't leave. So now she is not allowed to stay at my house. She didn't visit for 4 years and told everyone I was mean to her but oh well..... I stick to my guns. So she came for another weekend and stayed at a hotel.... again she booked the trip for 10 days. I spent time with her on the weekend but refused to see her any of the other days..... eventually when she realizes that I mean business and don't care what she says about me she starts to live by my rules when in my life. Set very strict boundaries and really stick to them... even if she throws a fit. If she is nasty on the phone tell her you won't take that abuse and hang up. The next time she is nasty on the phone just hang up without a word..... you already told her you won't listen so don't. Eventually she will either start to live by your rules or you just don't have her in your life. My mother is still just as nasty to my brother but she knows I won't tolerate it so she doesn't pull crap with me as much anymore.....