I own a partridge brahma who is always very lively. She is about 1-2 years old. She has been hiding away from the others and refusing to eat or drink. She also hasn't laid her daily egg (which she hasn't missed in months). She has only started exhibiting symptoms today, but I am still very worried about her. None of the other chickens are showing the same symptoms as her. There are no signs of trauma, but I am still very worried. I know that she has been laying eggs with thin shells for a while, and only yesterday did I put out oyster shells for them. I managed to get her to eat about five pieces of oatmeal out of my hand, but I couldn't get her to drink. Her poop is very runny and white (it even sometimes bubbles). I checked her to see if she was egg bound, but I didn't feel anything. She is now in a coop separate from the others with a nice bed and grass flooring.