I have 8 in my flock. All laying quite regularly. All getting fed organic nonGMO layer feed with oyster shell available. Matilda is a little over a year old---a very consistent layer of very large, gorgeous blue eggs. Like clockwork, probably 6 a week. She hasn't laid in about 5 days. She is healthy, saw her take a big ol' chicken poop just today, so she is not egg bound. But she has been in the nest almost everyday---runs out screaming her egg song like normal, but no egg. She's not broody...she spends plenty of time outside with the girls. She has all her regular normal behaviors, just no eggs are coming out. Is this anything to worry about???