Winner of the "Tranquility Lane Finest Meat Pie" award three years running, Mabel is suitably proud of her (delicious) accomplishment, and her hobby allows her to listen in and chat with all manner of friends and neighbors. No secret is safe with her around!
Like the other inhabitants of Vault 112, she is trapped in the Tranquility Lane simulation by Stanislaus Braun.
Tranquility Lane: Mabel is one of the residents one will have to kill if they choose to do all of Betty's tasks. If one kills Mabel before Braun gives them a request to kill her in a "creative" way, she will respawn.