This is really unique and really interesting, Darnay Cockrell!

I think you're really close to a solid logline. Maybe change "fight" to "destroy."

And maybe change "a grieving woman must fight them with weapons of the past—or cry the world to death" to "a woman (or her job) must destroy them with weapons of the past and overcome her grief before she cries the world to death." Or "must destroy them with ancient weapons and overcome her grief before she cries the world to death." "Overcome her grief" might not be part of the story though.