I have a sick chicken her rear end is plastered with green poo, her vent seems to be retracting. She is not really eating and a bit wobbly on her feet, I have put her in a box filled with straw in the laundry, as when I have had a sick chook a few months back she was thrown out of the henhouse by the other chooks. She drinks if I hold it up to her and her tummys gurgling when she does! What should I try to feed a sick chook and what could be wrong with her? Any help appreciated.