I have 4 silkie hens. Last night they all seemed fine, this morning I went out to feed and one of them was just sitting on the ground. She wouldn't try to run from you, I picked her up no sign of injury. I sit her in front of the food and she wouldnt eat. She did walk a few steps to the water and took a small drink and returned to her sitting position. She has her mouth open as well but only made a slight chrip. She is over a year old and was laying. Is she egg bound or is the most likely a sickness?