Hi, I just joined backyard chickens because of my Columbian Blacktail hybrid hen's health. She is very lethargic and has creamy, watery diarrhoea with green pieces in it. This all started about two days ago and since, I have been feeding her water with poultry tonic (vitamins) in it and layer's pellets that have been mashed into water. Today she will not eat the mash and I have to spoon feed her the poultry tonic water. She has her eyes closed almost all the time. I have kept her in an isolated, quiet, emergency nest away from the other chickens so that they don't get what she has. I phoned the seller, who has fully vaccinated her and wormed her before I bought her and he says to keep her isolated and for her to keep drinking the poultry tonic. This morning I felt her crop and it was not empty in the morning. It was slightly mushy and grainy (from the food). Please help me! I am really stuck here of what she has and if she does not make it, I don't want the other chickens getting what she has, but she is isolated though. Also I have felt her for bound eggs and I can't feel one. If you have any idea what she might have, I would love to hear it. Right now, it is almost like she is constantly asleep. I am doing everything I can for her, please help me! Thanks.