You could post some photos, since you seem quite worried. I don't think the absence of feathers should be you main priority at the moment. If the eggs don't hatch you can try and introduce her to chicks like you suggested, but be aware that it may not work out, especially when we take her experience and age into consideration. If you decide to follow through with getting chicks for her, you should have a backup plan in place. Alternatively, you may break her broodiness, and try again in the future, when she will be more mature, and perhaps the weather more suitable. There is always a possibility that she leaves the nest on her own, and given her age, I wouldn't be surprised if that is what she ends up doing, when her eggs don't hatch