I am going to be a proponent of culling her. Especially if the others start pecking at that vent. I think that even if you stop her from laying eggs now, when she starts back up again, the problem will reappear. I think you might just be prolonging the whole ordeal. Just my two cents. It must be a flaw in her laying system, and once it gets over stretched out, that she prolapse, I think it will continue to prolapse.
Mrs K
Mrs K