Well, all I can say is...Your chicken is very lucky to have you. And your very lucky to have a poultry vet nearby.
I've read about that happening from DE and more! Therefore, I don't use it anymore. Plus, I thought...Self....If I have to wear a N95 mask and gloves while dusting my coop, roost and inside the nesting boxes, why in the heck would I allow my chickens to be exposed to that fine powder in their little lungs when they're scratching away looking for something good to eat?
Plus, I really never had any luck with it anyway. The critter has to be submerged in the powder to maybe kill it. So, forget it. I use with much success Permethrin in my sprayer. Yes, I still wear a N95 mask and gloves but, at least it drys and remains effective and my girls aren't digging in it inside the coop, on the roost and in the nesting boxes while getting it into their little lungs.