A small fold-able wire dog crate is an invaluable tool for a chicken keeper........might be a good investment.
https://www.backyardchickens.com/a/foldable-wire-dog-crates-a-good-tool-for-every-chickeneer
Is she staying on nest all night too?
If you don't want her to hatch out chicks, best to break her broodiness promptly.
My experience went like this: After her setting for 3 days and nights in the nest, I put her in a wire dog crate with smaller wire on the bottom but no bedding, set up on a...