How do I deal with my mother 84 year old mother who has always been difficult?

Eight years ago, I bought a house with my mother. It is a two family home, we are completely separate. We both put the money from the sale of our each of our homes into buying this house. The house is in my name and my son's. I pay the mortgage. Six years ago I remarried and my husband moved in. My son bought his own home 2 years ago. My mother has what I believe to be boarderline personality disorder. She has always been very angry and had mood swings. She doesn't like many people and has never had friends. She and my father had a terrible marriage full of verbal and physical fighting. I am an only child. Now, she is constantly criticizing, complaining, and questioning every thing I do or say. She is controling and argumentative.

She recently turned a discussion into an argument resulting in her pushing and slapping my husband across the face. She had locks installed on all her doors that only she can open, and she is keeping my mail as she is home days when my husband and I are at work.

Legally, I can make her move. I would never do this to an 84 year old woman. However, she is ruining my life with her irrational behavior. She does not have dementia or many health problems. She still drives.

How do I deal this and live a semi-normal life? Right now we are not speaking to eachother. She has abused my husband which is totally unacceptable to me. The damage has been done and cannot be reversed.

I love her because she is my mother, but I do not like her. I regret the decision to buy this home together, but cannot sell it now. I feel stuck and helpless.

Any advice would be greatly appreciated. Thank you.