Deborah is portrayed by Deborah Knox in the movie The Rage: Carrie 2.
She also knew about the setup of Rachel, which Mark, Monica, Tracy and the others organized. Rachel snaps because of it and causes the Black Party by unleashing her telekinetic abilities killing most of the people there.
Deborah felt terror, when itl happened and ran mindlessly around the house because of it. She was killed by flying CDs that Rachel threw against her through her unleashed telekinetic powers. They all went into her body like knives and killed her correspondingly.