Dassa was a student at Vault-Tec University studying for her PhD in anthropology. While printing her thesis, the Great War broke out and she rushed to Vault 76. However, her father, a Vault-Tec employee, was only able to get two reservations into the vault. Dassa refused to go, insisting that he and her younger brother go to the vault instead of her.
Returning home to Charleston, Dassa survived on her own before enlisting with the Responders at some point. Throughout her years as a Responder, she assisted with the recovery after a devastating flood and created the Survivor Stories, a series of holodisks recorded by wastelanders that wanted to preserve their stories. Dassa died at some point prior to 2102, and her body can be found on a stretcher in the Flatwoods church.