If the Ramsey censuses give her birthplace as Michael c.1826 you could try earlier censuses for the Margaret Cannell bapt 23 July 1826 Kirk Michael, Father: JOHN CANNELL Mother: MARGT FARGHER [IGI], as well as the one Liz gave you, and other censuses for John Cannell to see which one looks likely to be her father as given at her marriage.

Sue