I have a sex-link that is 9mos old. Her eggs are big! XL and the shells are very thin. She has xtra calcium in her food, available on the ground, and I feed them all yogurt and peanut butter everyday. Her shells are the only ones that are that thin. I don't end up getting many of her eggs b/c they get cracked and/or broken alot. The other chickens crack them when they get in the nest with her or behind her. They are not doing it on purpose b/c they rarely eat the egg. Any suggestions?