If you are letting her hatch some eggs, you may have to remove her once the chicks start getting feathers on their little backs... maybe 6 weeks. Watch her because she may resume her nasty habit on them. If you remove her, just be ready with heat for the chicks as it will be a lot colder by then.
We had this happen with one of our broodies and she got quickly yanked out of the pen where the babies stayed. She was my daughter's bird so I don't know what happened to her after that.
No roosters, she just goes broody and sits others eggs or empty nests.