The body does need trace amounts of arsenic usually the levels in drinking water are plenty.

It sounds like she has Arsenic Toxicity. The best way to determine this is with a hair analysis.

Symptoms of Arsenic Toxicity include alopecia, constipation, confusion, delayed healing, dermatitis, diarrhea, drowsiness, edema, fatigue, GI complaints, headaches, burning and tingling, muscle pain, neuropanthy, numbness, numbness, pruritis, seizures, stomatitis and weakness.

There's a lot safer ways to treat Asthma and according the Dr. Joel Wallach it's a deficiency in essential fatty acids, manganese and magnesium.

Hope that helps.

I'd get a hair analysis just to make sure you aren't poising this little girl. If you are that's no problem either. Selenium and a few other vitamins are good at removing Arsenic from the body.