I have a Barred Rock with a problem. This year-old BR was a great producer until last week. She's now completely stopped laying, yet she won't leave the box unless I lift her out. She does eat and drink when I put her out in the run or let her range. I've given her yogurt and tomatoes to keep her hydrated, too. She and her roommates - all girls - spent the winter under a red heat lamp. so they never took a break from laying. I've seen no weight gain or discharge from the vent. She IS doing some moulting. My four other girls are fine. Is this girl becoming egg-bound, or am I seeing some sort of odd, seasonal broodiness? How long does it take for a girl to become egg-bound, and how can I help her if that's the case? Thanks for your ideas!