I'm still thinking the DE might be an issue. Here is the MSDS on the product she is using -- Stall Dry. It's for horses, but I don't know that that makes it safe for baby chix???
http://www.wicp.com/SiteCM/U/D/723263720370F29C.pdf
And, hey (!!!!) I'm not trying to blame anyone, but there's...
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And, isn't that one of the concerns with pool grade DE?
Here's the Wikipedia reference to silicosis, which is associated with inhalation of DE
http://en.wikipedia.org/wiki/Silicosis
Susan