My mother hen wants to be with the other hens now. She has 5 chicks that are 7 weeks old. Mom and chicks have been in a separate coop. I'm concerned about Mom not being with them at night to keep them warm. Our overnight temp. here is ranging between 27-36 degrees. She has been out with the other hens for 2 days and then I put her with the chicks at night. Was wondering if the chicks would be alright without Mom overnight.