It is stupid to trust doctor's implicity without asking several probling questions , this has nothing to do with a Doctor's inentions , but many things in medical science are based on a Doctor's opinions, so you need to know everything you can.
So implicity trusting a traditional doctor is not advised, implicity trusting "natural" cures is just as foolhardy, a drug is a drug is a drug, doesn't matter if it's articially created or extracted from some orchid that grows in the rain forest.
So stop arguing WHAT she should do, that is just plain rude, and just give her advice of how to find out for herself.