Good evening..I have a chicken that has had bright green poop, a swollen squishy belly, having trouble walking, waddles like a penguin, and hasn’t been drinking or eating much. I have been syringe feeding her water with corid in it but no changes. I took her outside to get fresh air and the flies were all over her. Does anyone have any idea what could be wrong? I have no other chickens exhibiting these symptoms. She is a buff Orpington that is about 2 years old. She is not laying eggs at all. I have been soaking her vent area as well in case she is egg bound. She also feels heavier. Thank you in advance for any help. This has been going on for about 7-10 days now.