Are you sure she is a leghorn. They are usely white and another reason, it may be a meat bird, only for eating. They only live a few months to a year or so.
Removing them for a week does not work. They killed 3 of my EE's and links.
and blinded 1 and put pecking holes in her head. Although they are best Eggers, I think the table is there next and final roost.