I know this is a topic that is addressed over and over-so I apologize. I have 1 out of 10 hens that has been laying soft shelled eggs for MONTHS now-I think it started last fall. She drops eggs semi regularly from her roost, and will also set in a nesting box and not produce an egg. I know it's 1 of 2 of my buff orpingtons and I'm going to have to separate one to figure out which it is. Yes, there are oyster shells available. What should I do?