Mother of the year.

After reading some of the stories on this, not only am i relieved, but i feel a little human again. My mother of 69 years old, just recently became mean, negative, racist and willing to throw me and my family under a bus at any time. She has no visable illness. I know her life was tough, immigrating from germany as a child, with abusive cold parents. Im loving, kind, emotionaly there for every one. Im drained now, im terminaly ill. I dont know how long i have to live. I thought id have my mom by my side at the end. We cant even talk any more. She was my transportation to medical appointments, she pulled that away over a stupid fight. I do not know what to do? Im 47 with a beautiful grand baby girl. They live with me, she has tried to come between us by 2 faced lieing. She seems normal enough, but she has changed. Not to her! Any one please share with me any advice please
Tina