Flora, Greta and Ruthie are broodmates. Flora began laying at 21 weeks, perfect for a barred rock. Greta followed suit at 23 weeks. It is now 28 weeks and Ruthie hasn't begun laying. Her comb and wattle are pretty small, too. She is healthy, large and loud, but hasn't started laying. Is she ok? Do some pullets just not lay? What is the latest a chicken will start?