Hello all, 10 month old cross-breed has very large baggy crop (impacted i suspect) little appetite. Has lost all feathers around her neck - does not look like moult. I've looked for lice and can't see any. Her skin is okay. Generally anti-social, last to eat, doesn't dust bath, and really scared of me. Her comb is up and red, tail up. Some weight loss. I wondered if the feather loss is related to the crop issues at all? I haven't treated her yet - will try olive oil or bicarb etc shortly. Should I isolate her? She's in a flock of 6 hens, all the others are normal, healthy and behaving like chickens.