When we did our late check last night I watched one of my RIR make what should have been an egg. All that came out was white and membrane no shell or yolk that I saw. They have oyster shell free choice. We have found fairy eggs before but didn't know who was making them. She appears otherwise healthy and active so I don't think she is retaining the shell. What can cause this? Is this a sign of old age? Don't know how old she is but would guess close to 2 years. Thanks