In 1931, her future grandson, Marty McFly, gave Edna Strickland a postcard from Calgary that had a risqué photograph of Trixie Trotter adorned on it. Sylvia lost her job as the "muse of progress" at the Hill Valley Science Expo since the rules required that she be an American citizen.
To rectify this, Arthur McFly rearranged his marriage plans. That night Arthur and Sylvia were married, which made Sylvia a dual citizen, and allowed her to resume her job.
When Arthur's father, William McFly, first heard about his son eloping, he was initially against it, calling Sylvia a "Canadian floozy". However, once he got to know her, he found that he liked her, and approved of the marriage.
- Back to the Future: The Game