I have 7 hens that are 6 months old. We consistently get 6 eggs a day. The ladies are free ranged or confined to a large portable run every day. Everyone is happy & active except for one of our Anconas. This hen has never laid and now she's acting lethargic. She's been like this for the past 4-5 days. I've gotten her to eat some worms and yogurt, but otherwise she is uninterested in food (though i did see her doing a small amount of foraging just now). Her vent looks completely normal and a digital exam revealed nothing. There is no swelling in the area. The inside of her mouth looks normal and her crop, apart from feeling pretty empty, seems fine. Her face & comb are pale, but they redden up when we try to catch her and from time to time. She has been checked extensively for mites/lice. Today, her poo was thin, white and was mostly bubbles (maybe from the yogurt?).She still tries to run away when we go to catch her but otherwise she just lays around or stands with her tail down or occasionally forages in the grass (but doesn't seem to eat anything). We suspect she may be an internal layer because she is the only hen to have never laid. They have free choice of oyster shell & get an organic layer pellet. How do I know when/if to cull her? I don't want to have a suffering hen, but I also don't want to cull her if there is a decent chance of her recovering and laying. Right now I'm just trying to keep her comfortable & let her relax where she wants. Thoughts?