My mother has staph infection all over her leg, but wont go to the doctor. How can I get her to go?

My mother is scared of the doctor and is having all sorts of health problems including what looks like a nasty staph infection all over her leg. I will make her a doctor appointment and when they call her to confirm if she will be there she cancels it. She has had a cough for 5 months that wont go away and pain in her stomach. We have colon cancer in the family and she also refuses to get checked out for colon cancer. I am afraid my mom will die if she is not seen by doctors. Help me what can I do?