If you're refused medical care, what's next?

My neighbor is a 48 year old women who has lumps under her skin all over. In addition she is in a lot of pain with her foot. She has shown us an X-ray that shows a hole in her ankle bone! It is very scary. She has been to a GP and another doctor who won't help her manage her pain because she had a history of drug abuse. And they have not given her a diagnosis.

She no doubt is in pain and we are trying to encourage her to go out of town either to University Medical Center in Jackson, MS or to Tulane in New Orleans and go in and just say, hey my foot hurts and let them diagnose her. At this point she can hardly walk and we are afraid that she may have cancer of the bone. She usually keeps her yard, garden and flowers immaculate and we are tending to her outdoor work as she can not do it. What would you suggest? Please.