Just see if she stays put. If she starts to puff up and growl at you, she is broody. I would give her a golf ball or an unfertilized egg for a few days and see if she is serious. Set it in front of her and see if she tucks it. If she seems serious after a few days, give her some fertilized eggs. I would bring her inside to hatch eggs though. Its just really cold. The babies wont ever come out from under her in below zero weather, and that means no exercise for mom. You may have to keep an eye on her. Once a day in the evening take her off the eggs to stretch and poo and eat. Broodies can drop weight quickly. Give her vitamins and ACV to keep her healthy. If you can dust her for parasites before the eggs hatch because she wont be moving much. Did that silkie egg ever hatch? or did you have to throw it out?The chicks look like they are really lightening up! I think I have a showgirl starting to go broody. She was sitting on her egg this afternoon. Hmm. Do I try to put eggs under her or not....