My beautiful, 8-month-old Easter Egger is laying lumpy eggs. About 2 weeks ago, she laid a shell-less egg. She has been laying for 3 months now. Her eggs are large to extra-large. She lays about 6 times a week, really more than I expected of an EE. My hens have crushed oyster shells available if they need calcium. She and 3 other chickens are caged in a chicken tractor with a small run, but I let them out 4 times a week for about 45 minutes each time to run the .25 acre yard while I watch them. I don't know what to do. Please advise.