In the last couple of days my hen is acting strange. It is coming to the end of winter and my other 3 hens are acting just fine. Running, eating scratching around etc. However one isn't. She doesn't run out of the coop when I let them out in the morn like she usually would. She just stands. I picked her up and put her in the grass and she just doesn't seem to want to do anything. I checked her bottom too see if if was clogged. Her bottom hole seemed clear and normal however poo was caught in feathers. It seemed a little green in parts too. Any ideas as to what is wrong, what I should do or what to check/look out for? Thanks a lot.