Chicken is hen, speckled dom, about 4 months old. Started getting lethargic, weak, drooping wings, clear liquid poop with bright green mush. Separated her from her sister as she started plucking her tail feathers. Gave her milk, yogurt, oatmeal, amprol mix, but now after 2 days I have to syringe feed her. Got her in a small animal cage with heat lamp. No wheezes, or any respiratory signs/sx. What should I do. I also have 3 RIR (11 months) and they are fine. Her sister is doing fine as well. What is going on???? Here are some pics:





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