Broodyness

Can anyone give me some advice on what to do with a broody chicken? At least I think thats what she is, I have 3 chickens, and one of them , the silver sussex will not come off the nest. She also has a bald tummy, although I do keep the house clean, and use Diatoms. She has been like this  for about a week, she hasnt laid an egg for two days now. I have been gently lifting her out of the box and putting her outside. She does seem to act normally for a short while, but quickly goes back to the nest. I remove all eggs promptly, but I'm at loss wether  I should leave her, or take the lid off the coup so exposing her, or take her off the nest each day and close the door so that she cant get back in. Sorry its a bit long winded.

If you can shut her out of the coop it may help
They can be really determined sometimes

With mine I just keep getting them off the nest, take all the eggs away and they give up eventually


Sarah