If you want her to raise chicks get some fertile eggs and place them under her, if you don't there are ways to break her from being broody, one trick I learned but have never tried is to place them in a wire cage off the ground, the cool air under her may bring her out of her broodiness.
Out of all the hens I have had I have only dealt with one broody, My BA, although most hens will get off their nest once a day to eat and poop mine did not, after the fourth day I literally had to pick her up and move her off her nest, it took her a bit to be able to walk which thankfully she...