I have seven hens ranging from 18-28 wks. We have three laying eggs but one of the 28 wks old just lays in the nest for about an hour everyday... sings her egg song and leaves the nest empty?? She even fusses at the other hens if they lay in the nest too long... what's going on with her? She has been doing this for about six weeks. We keep thinking today is the day for Lucy... but not so what's wrong with our Lucy?