She appeared sick, staying in hen house most of the day, lethargic when out in run. Next day she was fine, but have only had 2 eggs from her in 3 weeks, white only. She's had diarrhea or loose stool for a long time, but has always had good production until 3 weeks ago. Thought perhaps at first she had an egg stuck but with the small eggs guess not. Any ideas? Her vent seems as clean as ever.