Livid with My Mother

I don't know what to do. This woman is driving me insane. I am a 43 year old mother, business owner, wife...just trying to raise my kids right. But I have this woman who has a tendency of sticking her nose into where it dont belong. I dont understand what right she has bad mouthing my husband in front the kids in my house, telling my kids that I didnt have to want for anything as a child when she knows its not true and literally putting down my daughters friend in front of both of them. She didnt like the company so this woman left. Like I told my girls this is our house, their grandmother (if thats what you want to call her) has no right coming here and running our house like she did when I was a kid. My kids witness the hell I had to go through with that woman, they put up with it every time she is here I did have a good childhood with my father, but my mother, shes textbook material. If she doesnt like my husband then I wish she'd stay away...I dont want her here. I dont think this woman can say one good thing about anyone unless they are kissing her ass, and when they quit, watch out. Its terrible to say this but I really dont want my kids associating with her...shes not a good influence like she thinks she is. I want to move...I want away from her. She is not going to make my kids and I miserable just because she is. Shes always been like that. Everyone owes her a living, and if she not happy she will damn sure make it a point to make everyone unhappy. For years I listened to her put my father down, he passed, and she still does it. I dont give a crap about the past, I know what I know about my dad. We as kids and adult children had great times with our father. I try to make up excuses for her, such as she didnt have a great childhood cuz her parents were alcoholics and she had to quit school to take care of her other 8 siblings. To get out of the house she married young had three daughters, divorced, he took the girls. She married my dad, had 4 more children and here shortly there will be only one child that has anything to do with her. I know life is short but that is exactly why I am tired of going through hell. I am livid over the whole situation...and dont know what to do.