I have a barred rock hen that is about 5+ years old. She quit laying about 9 months ago and has become queen of the roost, but about 8 weeks ago we got a very tiny dark brown egg. We thought it was from one of our new babies but it turns out that she has laid 2 more since then. They are just like a new chick egg without any yolk... very strange! Has anyone ever heard of this happening? She used to lay the most beautiful huge eggs but now... we are totally confused. Any help??? Thanks