Just please remember, not all hens are ready for chicks until after they have sat for a while, be very observant of her behavior when they hatch, some hens will flat out refuse chicks until they have sat for a couple of weeks...there is just no way to tell until you try. And staggering chick ages is risky to the young ones, so be prepared to rescue them and raise them in a brooder if they struggle to keep up.