There should be some way to get her to go..cost can be addressed later.
The team trainer?
free clinic?
ER - hospitals write off services all the time...

What about other relatives grandparents aunts/uncles /cousins?
She shouldn't be carrying the burden of her parents illnesses all alone..

2 non related by blood persons in the same home and both got dx with cancer??
I'd look into toxins in the home or some environmental causes.. especially if they lived in same home for a long time.