She's about 2 years old. For about 2 weeks now, she has had greenish-yellow very soft or liquid poo. We have washed her backside with warm soapy water twice just to make her more comfortable, but it comes right back. She is still eating and drinking and getting around.with the others, but hasn't been laying. Just today I noticed that she is fluffing up her feathers and walking with her back sort of hunched up. What could this be? Thanks so much.