Hooray for the turn around!!! I was worried. I wanted to let you know that I've used Sevin dust on my animals for years and they all live to a ripe old age. DE is a good deterrent for mites and lice but not an effective treatment once an infestation has taken hold.
Sevin dust is the most effective product to use. I literally rub the dust all over with my hand, making sure to get the belly, the back end, under wings, between toes if it's a dog or a cat. Other people take precautions with masks and rubber gloves -- whatever. Another method is to dump a couple of cups of Sevin dust in a plastic bag, put the hen in the bag up to her head. Gather the bag around her neck. Maneuver the dust within the bag to completely coat the chicken.
Oh, Sevin dust can be had at hardware stores or garden stores. I'm wishing her a continued improvement. Let us know how she does.
Jenny