The Ivermectin is worth a shot.Yes I’m treating the girls too. Tonight I just put ivermectin on all the chickens. I just did a drop on base of neck and a drop under wing for 13 chickens. A couple of them wouldn’t let me put any under wing so I just put an extra drop at base of neck. I also put Vaseline on their feet. They don’t have scaly mites but I figured maybe that will help so the mite won’t crawl on their feet.
Do repeat in 10 days. You may want to get a weight on your girls to ensure you are giving the correct dose of Ivermectin Pour On. It's 0.09ml per pound of weight, so hopefully a drop would do it?
The Ivermectin should be applied along the base of the neck at the spine making contact with the skin too, so make sure to part the feathers.
Hopefully you can give them some relief. Vaseline on the feet and legs won't hurt one bit.