Not if you have hodgkin's. It is near 100%. If you have testicular, it is now quite high. Non-hodgkin's is reasonable.
Of course, if you have advanced breast, liver, pancreatic, or colon, the chemo success rate is near 0%.
My point is to consider traditional treatments when they are effective and have decent survival rate. Each cancer and stage has different set of choices.
THis person is facing serious cancer that may still be treatable. Natural healing is increasingly difficult as disease progresses. At a point, you run out of options and time. I fear that this person is much closer to that point than she realizes.