Should I call my mother back if I dont want anything to do with her and its upsetting?

My mother stabbed me in the back and interfeared with my life in a bad way and trash talked me to extended family ext. Im a good person but I had an affair and went through a divorce. It was horrible so I went to counciling and turned my life around for the better. When I was going through the diffucult time and had a nervous breakdown she paid for my ex husbands divorce lawyer, had him up to their vacation home, sunday dinners, called him and told him everything she could I confided in her with, called me a whore and said I should get gang raped, called and left terribly mean and abusive messages on my phone, went through my cell phone and dropped it down the sewer, had my ex husband and his girlfriend over for dinner, accused me of being nuts or on drugs ( furthest from the truth) So I told her she was dead to me and I havent spoken to her or any extended family in almost a year. I am on good terms with my ex, my buisness is good, i have two daugters that are such joys and are well adjusted. My current relationship is wonderful. Life goes on and I know the mistakes I made dont define me.. They show me who Im not and I dont deserve to be treated so poorly by my own mother. She is all doom and gloom. I think it pisses her off to see that Im doing so well and pulled through on my own quite well. She always reads more into it and thinks terrible things. She still tries to call me everyday. She leaves mean messages or ones that say the family needs help, or there is something I should know and i will regret not calling her back. I just want to continue to be happy and enjoy my own family without her crap bringing me down. What should I do continue to ignore her, call her back, write her a letter or get her phone number blocked? Its stressing me out.