My 3 year old Americana chicken (the one in profile pic) isn’t doing too well. First noticed last week when she had green poop stuck to feathers outside of her vent. As of right now she won’t eat food, except for mealworms, has lost almost all of her weight but her feathers still look good and she still drinks water. This afternoon she was too weak to stand up on her own but still has her eyes open and looks at food as if she wants to eat. At first I thought she was egg bound as one of my rhode island reds was a couple weeks ago however when I felt around in her vent white particle stuff only came out and couldn’t go very far at all. I washed the green hard poop away and she seems more alert right now but still won’t really eat. I think it might be worms , but we’ve never had the problem before and the rest of the flock is doing great. If anyone has any suggestions or knows what it could be please comment , can take all the help I can get.