I keep thinking about you and I wanted to add if the chick hatches out, it will have to be somewhere very warm to dry up. I had my first hatch this weekend and it's a very long story and I messed things up. To get my two babies dry that did make it I turned on my electric blanket - cold where I live and I make about zero body heat - and put the chicks in my hand and cupped them and kept them in my hands under the blankets like that. It worked, but it took about four hours. That is the only part that I don't know if momma hen will do. She should be sitting on her babies quite a bit, so that might work putting it under her as soon as it is born. I have more broody hen experience than hatching experience.