My 1 1/2 year old barred rock became suddenly ill today. Lethargic, unable to walk or stand for a period, possible fever and with abdomen distended. While I was running the warm water to treat for egg bound, I placed her in the nest where she passed an egg. Her crop was also watery, squishy and full, so wondering if sour crop so I gently massaged and she expelled mostly water some yellowish fluid when I tilted her head down. I proceeded with the warm epsom salt bath and she was very thirsty drinking the water in the tub. There is no egg palpable in the vent and it feels like a large open area, with some yellow drainage minimal, when I checked the vent. Her vent continues to contract like she is trying to expel something. I have placed her in an isololated place for the last 2 hours but she remains lethargic, not standing and has refilled the crop with water and her abdomen(?-or area diretly below the vent) remains distended and full. I have only pet hens. They have a 12x12 coop with 2 nest boxes, and an outdoor run for the day. I feed Layena feed, scratch feed, and grit with some meal worm treats. I give soem greek yogurt, but it usually the other hen that prefers it. She recently changed nesting boxes and may have skipped a day. Not sure whether to offer food/water, or withold it, and which direction to go.