While presenting your case you should also provide more info about the environment of where the child is raised and the kind of food she is fed. Part of the solution is to stop doing what cause the cancer, the other part is to provide nutrition to help the body fight the cancer. Is the environment polluted or with mold? What kind of food, processed or natural? ...
I know there are spices that can help fight cancer. Some work synergistically: Turmeric with black pepper, ginger with black pepper, ... Probably it is easy to get some of these spices especially fresh.