KneelandChicks, I would love an update on your leghorn. I had a similar thing happen with my 10 month old Golden Buff. She too was my best layer (6 a week) and leader. I found a large yellowish mass that looked like fatty tissue surrounding a yolk in the next box. She didn't lay again til 7 days later when she laid a shell less egg. It's been 6 days since the shell less egg and still nothing. She eats, drinks, and runs around just fine. She has free choice of oyster shells for calcium. Her abdomen is much larger than the other girls and her stool is a little runny. Did the warm bath help your girl? Do you or anyone else have advice? This is my first time raising chickens. Thank you! ~C