My pekin bantam has not laid an egg ever. All my other bantams have laid eggs and they all lay in their nesting boxes. They are 40 weeks old. What is wrong with this chook? Her comb looks healthy, she has been wormed and acts normal. Any thoughts? She is not a rooster, she was bought with her 3 other friends and looks just like the other three. She is free range but I have watched her closely for weeks listening for her after egg cackling. She hasn't done that either. Thanks.