Did the doctor give her any Antibiotics when she had her health troubles before?
You could follow the anti-yeast diet (everybody seems to have a different idea as to what the diet should consist of). In a nut shell, it's a diet which avoids most carbohydrates and foods which contain mold. The diet which helped me feel better was a meat and most vegetables diet. This, followed strictly, plus a yeast killer and probiotic, helped me feel better.
You should consider the possibility that there is something else causing your daughter's yeast problem (assuming that's what it is). For me and others, it is connected to the presence of heavy metals. In my case it is mercury from silver fillings, but there are other metals and other sources (some of the sources are very unexpected). I suggest some research into heavy metal toxicity to see if it makes sense in your daughter's case.