Hi Deborah,
It is not for me, not being a medical professional, to tell you which one is best for your mother in her situation. Therefore, I shall tell you what I would tell anybody in your position: Type in each name I mentioned in your search engine and read all about the product (entering the name followed by "research", "criticisms" etc. can give you some interesting insights from people other that the manufactures, who will be biased). Also, try as many forums and cancer sites as you can (conventional and alternative) and search for reviews and views on the product. When you understand more about how each one works, and decide on certain other factors (although a hundred times cheaper than chemo, these things are not free), get all of the information together. Then take it to your mother's oncologist and ask him to explain why your mother should not take whichever product. I have never heard of any contraindications with such items, but I could be wrong.
Unfortunately people hold so much store in doctors opinions as to be almost awestruck; and although they should be respected as professionals, they are not above being pig arrogant regarding something they know nothing about. I have witnessed their errors too many times to take whatever they say as fact (I come from a medical family and sometimes work with doctors). Besides, these products are immunology based, so why should an oncologist, who has to keep up-to-date with his/her own expertise, know much about them? If he is dismissive, go see and immunologist.
Good luck,
Conrad