Do not have her take anything she wishes not to. It is her body and being a doctor of both alternative/modern medicine, I would suggest do not take it either.
There is good reason.
Also, it is a shame to hear what she has gone through. Depending on what type of tumor, where it is located etc, Dr. Burzenski here in Houston, Texas has a really good treatment outcome utilizing synthetic urine to shrink tumors as well as keeping them from growing.
Now that she has done radiation and chemotherapy medications, it would probably contradict the treatment available through Dr. Burzenski.