My advice, for whatever it is worth, is to discuss with her doctor, in greater detail, the doctor's thoughts on changing the chemotherapy regimen. Some cancers do not respond well to certain chemotherapies, and some patients simply cannot tolerate some treatments.
Thanks. The problem is that I've read that some time (5-6 months) is required in order to know for sure if the cancer is resistant to a certain kind of therapy. Now this is new, change of the therapy only after 3 weeks ... Anyways - thank you.