Oh, I have had bad experiences with chicks hatched in the pen. My cuckoo marans look at them like little mice, just attack them and kill them as soon as they scare the mama away from them. I won't let them brood any more.
If your daughter just wants eggs, I always tell people that want girls only that hatcheries or feed stores are the way to go. I will sometimes have chicks last long enough to sex, but I can sell 8 week old black copper pullets for $20 each. The average chicken keeper will be just as happy with pet quality chicks for a lot less money.
Those are friendly little birds, aren't they? These are my favorite flocks I've ever had