Broody hen affecting others’ laying?

[rosemarythyme]

I have one broody hen for over a month now. No matter what I do all she wants is to lay in the egg box and prevent others from laying. Then, if they do, she sits on their eggs!
She won’t lay, isn’t egg bound, rarely eats, and is driving everyone crazy!

She's already sat too long. You really need to break her for her own health.