We've got a Black Star (~9 months old, laying for ~2 months) who is lethargic, not eating, and not drinking much. We noticed this behavior 4 days ago and encouraged her to eat and the next day she was fine (running around, inquisitive, etc.). Yesterday and today she's back to moving very little and not eating. We brought her inside to watch her this morning. Her poop, what little there has been, is thin, yellowish, and mucousy. She's eaten a little bit of the scrambled eggs and grit we gave her but has yet to drink. I felt around for an egg (egg bound?) but didn't feel anything (caveat; this is our first flock and I'm still quite green). Her crop is large and squooshy like it's filled with air. We had her sit in a tub of warm water for a bit. Right now she's resting on a heating pad. What else can we do? The other chickens seem fine.