Hi everyone! I come to post on my friends behalf, she has a hen named Rosie who is an isa brown (100% hen). This hen is a little over a year old and has not started egg laying. Does anyone know what the cause of this could be? A extra late layer? She is a good weight and eats well, not sure about mites, lice, or worms. Is there such thing as a infertile hen that will never lay? Thanks!