I have a 3 yo red sex link hen who started out 5 days ago with sour crop. It was huge and liquidy, so I isolated her, withdrew food, put poly vi sol in her water and massaged her crop. Also I kept her in muted light. Crop seemed to go down. Day 3, morning, I gave her an egg and some yogurt as her keel was poking out. Her butt was dirty but not especially unusually so. I cleaned it as much as I could. She seemed unbalanced then and very quiet. She let me poke, prod and massage with not a peep or squawk. Today (Day 5) I found dried egg on her butt, she wobbles and can't stand up, and her toes are curled. I don't feel any egg shell around her vent although I think there was some in her tail feathers. I gave her a warm water sitze bath, just her butt, not up to her shoulders as was suggested in one post. Then I put her under a heat lamp to dry off. What am I missing? Anything else to do? She hasn't gotten any worse as her symptoms have changed. She still drinks and pecks at the yoghurt, but can't walk to it. I feed Dumor layer pellets with free choice calcium. She free-ranges. None of her 8 sisters have developed these problems. Poop is squirty, liquidy and has green parts. Poop smells chemical-like.