If you choose to make your chickens pets than you get what you ask for if they are food than dont make them your pets by feeding them treats and teaching them thing they are food or pets choose then remind DD of that and remember who is the parent.
How much light are they expoused to a day how cold has it been getting and if all else fails put a couple of golf balls in the nesting boxes
They should be getting about 16 hrs of some kind of light ie sun or light bulb also depends on how cold the coup is.