Every brood we have had has been from a broody hen, She should do fine if you allow her to hatch, only thing to make sure is that all the eggs are covered properly and that none have cracks, also if you allow her to hatch don't look under her at all in the last week and then for about 2 days after you suspect they have hatched.
don't bother moveing her off for food water etc she knows better than anyhuman,
If however you don't want her to hatch,i would suggest ducking her under carriage in a bucket of cold water, of sitting her somewhere where air can flow freely around her, etc a dog cage mounted at the corners on bricks,
Happy Hatching (or not)
Cameron