Are you sure she's broody since she wants out? Plus she should be in an area where she can still get off the next and wander around , eat, drink, ect. She will only stay on the nest non-stop once its the last few days . If she is broody you should notice her gathering eggs on her own and trying to sit on them. I follow what the broody wants, if she only collects 6 before sitting then I let her keep 6. I don't add eggs to her clutch. But that's how I do it.