Went to the coop this AM and one of my 6 hens was on the bottem of the house in the straw half squatting and with her tail tucked. She keeps pulsing her tail and if something comes out it is watery and looks a lot like an egg yolk. She is closing her eyes and seems restful when I hold her. Her abdomen feels smaller than the other hens. I have separated her and offered her food and water. She is at this time uninterested. What next?