Know how you feel! Was watching mine with the biggest comb certain eggs were any day when ''she'' stared to crow! Luckily they were bought as guaranteed hens and with the proviso that if the breeder had made a mistake. They would replace. Orpingtons are slow to mature and mistakes are sometimes...
Also try googling '' Chicken blogs'' and searching '' egg squat '' some good articles and pictures.Not sure I'm allowed to give you specifics on this site.
It's a submissive gesture that they do for the rooster or sometimes for a chicken higher in the pecking order.Also for humans.if you put your hand out as if to pet them and they squat and spread their wings out bracing themselves slightly.It's a sign of maturity.There's no point in the rooster...