Gabriella's ex-husband, Antonio Salavar, was an employee of Vault-Tec and submitted her name to become the overseer of Vault 94. She, alongside her congregation, came via bus to Vault 94 before the Great War.
A year and a day after, on October 24, 2078, the vault door opened and Salavar sent "Vault 94 ambassadors" to Appalachia to serve as missionaries. Not long after, a group of wastelanders from Harpers Ferry raided the vault, believing that the ambassadors were attempting to lead them into a trap. They killed everyone in the vault, including Gabriella.