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Trace amounts of stuff are everywhere--soil, carpeting, air, and especially tap water. It's not at the level of eating lead paint or anything, this is the little stuff normal bodies just process right out. But if you don't process it, it builds up, and eventually gets to dangerous levels. If you've already broken the system, for example, 4 vaccination shots will get you to a symptomatic level of aluminum. (You get trace amounts of aluminum drinking sodas in cans, too, not that she's ever had a soda.) Most cities' tap water would get you to dangerous levels of several things in just a few months of drinking it. Cheap bed mattresses commonly use arsenic as a flame retardant. Or if you have a single piece-of-crap toy from China with lead in it, chewing on that one toy could do it. We're constantly taking it in and peeing it out, no harm done. But if you couldn't pee it out, you'd be in trouble.
I do think she has some buildup, but we'll obviously test to be sure. And once we know she's high in, say, arsenic, we can get appropriate test kit(s) that we can use on stuff around the house to help us figure out where it's coming from and hopefully get rid of the offending item.
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