Okay, jeez. We ended up dusting (with permethrin) all 3 hens, cleaning out and burning all the straw in the chicken house, dusting the chicken house, and putting shavings that we currently use for the chicks in our garage in instead. We'll replace the shavings with more shavings (unless someone has a better suggestion) in a week. Made my broody hen real upset but there were mites in the nest and on her. We also put olive oil on the 8 year old's legs just in case of leg mites even though her legs aren't scaly. Anything we missed???? Now I guess we need to build a nest box or two because she was nesting on top of the straw bale.
Thank you for suggestions previous and yet to come!