we have 8 hens 5 rhode island reds, 3 light brahams, and 1 amercuana. they are all about 7 months old. the R I R's started laying about a month ago, the Brahams started about 2 weeks ago. the Amercuana has still not laid. she goes through all the motions even sets on the nest and makes loud clucking noises, but no egg. the wife is starting to worry about her. he is a healthy hen, but no eggs, i told her not to worry she would start laying when she gets ready. is this normal for this breed of chicken?