Hi, recently we rescued an older barred rock hen who was being abused by the flocks rooster. We took her with us to join our flock of four. She’s in quarantine before I introduce her to our girls, but I notice she’s in bad shape. Miskept feathers, pale comb with some scabbing, swollen feet, lethargic disposition, and her vent and belly are covered in tiny grey mites? Lice? They’ve collected on the shaft of the feathers in that area. We gave her a thorough dust bath with DE as that’s all we had on hand. We also rubbed her legs with petroleum. This morning she’s more alert but definitely still in discomfort. I’m a fairly new flock owner, and raised my current girls from hatchlings and haven’t had to deal with this yet and fairly overwhelmed with how to go about treating her. Any and all advice on how to de-infest her and help her heal is greatly needed.