I noticed she was in coop alot checking out the nests , also I looked at her vent . It was more open and wider that the other chickens. I have another red sex link whos comb and waddle are MUCH bigger and redder than the one that laid this morning .. her vent is still closed .So the comb is not a sure fire way of geussing at the first layer . OH ! another things she was sqauking a lot ... she did not sing the egg song till she was done laying but she did squack and carry on a bunch .