If She is so insistent you could just let her hatch, Could that be an option?
Extreme broodieness!!!!! - Page 3
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She Could stop, but its also possible that she just wants to raise chicks. Maybe in a week if she is still broody you could give her some eggs. it doesn't have to be a lot. It could be 3 eggs or more. as long as she can cover the eggs you are good.
have you seen her get up to get food and water?
ok. how long has she been broody
Honestly At this point if you can't stop her just give her a few eggs to hatch, or you could also purchase a few chicks and put them under her and see if she will accept them