One of my hens was in a separate pen with the rooster. A week ago she got all broody and started sitting on about 5 or 6 of her eggs. I haven't touched her just to see what she would do. Is it possible that she could incubate and hatch these, even if it is getting chilly at night (35-45 F)? If the eggs hatch and I don't notice for a few hours (like if they hatch at night), will the chicks stay under her and survive or will they all die?