Isolation in the case of a broody doesn't mean removing the broody from the flock entirely. Just keeping her confined in a situation where she can't possibly nest.
This is what I did: https://www.backyardchickens.com/articles/outdoor-broody-breaker.76592/
This is what I did: https://www.backyardchickens.com/articles/outdoor-broody-breaker.76592/
