I have a 39 week old pullet who is moving very slowly and laying down all the time. She seems to be getting weaker every day for the past 2weeks. She's eating and drinking. I give lots of treats and good layers feed. They free range for at least a few hours every day, sometimes longer. The odd thing is her poo. It's green which looks like freshly mowed grass and I can clearly make out some mullet and corn from the scratch I give them. It's like she's not digesting her food and maybe not absorbing the nutrients from it which may be why she's so weak. That's my best guess anyway. Has anyone ever seen anything like this?