Sorry to hear of the losses to predators, and to the cold. I have a BR broody who was on 7 eggs I had marked. The other hens kept getting in, so yesterday I tied some gauzy material to keep the extra hens out, but came in and found one of her sisters had barged in, and there were empty egg shells. This morning she only had three eggs. Very soon I will move her to a dog traveling crate, and hope she herself has not developed a taste for sprouted eggs. If it doesn't work out, I'll have less problems with over crowding...and chicken math.
This is the first time I've had a broody on eggs. Last year Mama raised two sets of day old chicks for me, so these eggs are a new experience.