I removed her from the box for almost a week, we also gave her a cool bath for 3 days. The final try was to sneak a baby chick that she pecked at, so I moved her to a new coop so the baby can have her safe area.
Hi and welcome to BYC! We're glad you joined us! How long has your girl been broody? Did you try putting her in a wire dog crate? Good luck, sometimes it's a real challenge to break a stubborn broody.