Daughter of Thomas and Elizabeth Campbell. She traveled with her parents and her siblings. The Campbell family emigrated from England by way of the ship American Congress in 1866. They continued their westward journey in 1868 with the Seeley Company.
Her death certificate shows her name as "Mary Spence," and her birth date is shown as 4 October 1850, and her death as 28 July 1921. The Utah State History Cemeteries and Burials Database show her birth date as 4 October 1850, and herdeath date as 28 July 1921.