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How old is she? A seriously broody girl will be constantly on her nest, only getting up a few times to eat and poop. Having kids will suddenly be her sole goal in life (if she's a good broody). She also will most likely exhibit defensive behaviors by puffing up and "growling" at you if you put your hand near her. A few of my older girls who are experienced mothers actually scream at me from the nest when I walk into the broody coop.
She may be in the "pre stages." If she gets to the point to where she won't leave the nest box, you more than likely will have a broody on your hands. Some hens are really indecisive about it. They'll act like they want to, but then they never do. Others will set on a dime. The worst ones are the ones that set on a clutch and quit a week or two in. In any case, a hen raising the chicks the way nature intended is the best and easiest way to do it. It's all hardwired into her brain. She'll figure it out.
Be sure that the eggs that you want hatch are under a Broody hens it's not normal for a hen just to set all the time but when they go broody you will know it there fluff their feathers out and fast and not want to get off the nest. The normal temperature for a chicken is around a hundred and five degrees a Broody hen can keep her eggs warm she'll get down only periodically to eat and drink and get right back on in the dead of winter I will bring my broody and her eggs in and put her in a crate so the babies don't have to hatch wet in the very cold but the mother will take care of them and keep them warm if it's not extreme cold. I am a breeder I use an incubator but would much rather have my hens hatch and raise the babies.
