Her married name was Davis, and she is listed twice in the 1850 census; once as Jane Davis age 31 and head of household for her brother James’ children, and again as Jane McCuin age 24 with her parents and siblings (on the same page).
Listed as Jane McCune (52, PA) and living with the family of her brother Robert in 1880.
Her death certificate lists her mother as Sallie Martin, and says she died of old age with diseased liver & kidney - dropsy.