Hi, My Blue Andalusian has, for the past two days, layed an egg that is cracked at the narrow end. Yesterday, I thought maybe another hen may have cracked it because there were two eggs when I collected. But today, she was the first to lay. The shell is thin at the narrow end (and overall much thinner that the other two hens lay) and she lays the biggest eggs of the the three. Has anyone experienced this before and can you offer any suggestions? I feed them back their eggshells, but maybe she needs more. Thanks.