I have a three year old hen who has been acting reclusive and a bit lethargic for over a week. The area around her vent was back with scabbing underneath, which looks like mites to us. We've treated everyone with permethrins as well as coop and yard. Since she refuses to come out of the corner of the coop, face into corner, we brought her in where it's warm and she has free access to food and water. I gave her a warm sitz bath and will do so again tonight to try and soften up that area. Also cleaned the area well with soap and water. However, her poop is just like water. She's pecking at food but not really eating. All others in the coop appear healthy. Any suggestions?