I have been housing my Silkie and her adopted chicks (7 chicks - 4 weeks old) in my basement in a large tote aka "broody box". The basement is 50F. The chicks are almost entirely feathered out. I moved the Mama and brood out into the coop today. They are completely seperate from the rest of the flock. I installed a 75 watt light just above the nest box. It is 45-50F during the day and 29-34F at night. Will she be able to keep them warm enough??