Chicks hatch under their mothers in freezing weather all the time. As long as she wasn't allowed to set more eggs than she could cover, they're best left with her.I took it away because it was very cold and I could even see frost on the grass, I worried that the chick might freeze if it were still alive.
so we thought that just for hatching well put in in a incubator, since when chicks hatch they're wet and if it hatches at night it might freeze..