Weapons: Aunt Gladys "witch" spoiler discussion @WarnerBros

Here's what is known about the witch in the movie "Weapons":
Name: Gladys, portrayed by Amy Madigan.
Role: She's the villain behind the mysterious disappearance of 17 children.
Methods: Gladys uses witchcraft involving a potted tree, personal items, and a bell to mind-control people, turning them into her "weapons" or targets. She drains people's life force to sustain herself and remain youthful.