I have 5 EE girls about 30 weeks old. One started laying about 18 weeks old. Another at about 21 weeks old. The other 3 have yet to produce one egg. They are in the same coop with 6 barred rocks of the same age. (They have been together since day old chicks). Barred rocks also laying just fine. Plenty of room plenty next boxes to accommodate 11. They also free range. No real stressors that I can see. I have been watching them very closely when they are out to see if they are laying somewhere else. I even kept them cooped for an entire week last week and still nothing. I'm stumped. Any advice?