Chemo....modern medicines version of snake oil.
Tell her to take her money & go do any damned thing she has always wanted & refuse that quackery.
Estimations of longevity are purely specualtive. She may last 3 months or 15 years. They know nothing,
Firstly, health care is covered here in Canada.
Secondly, when my dad died from complications from a bone marrow transplant he had NO cancer left in his system...after having had chemo.