I have 5 chickens roughly the same age. The first one started laying August 1st. The next three started in the beginning of October. The fifth one does not lay. She is old enough now but has never laid an egg. Her behavior is still as if she is a pullet. She runs away from me and acts nervous. The others will do the submissive "hen squat" and let me pet them (when that behavior starts they usually start laying after that). Do I just have a bad layer?