Margaret was born in October 1818 as recorded in Kirriemuir Associate Church register. Her early life is well recorded by her son J M Barrie, the author in his book "Margaret Ogilvy, My Mother".
She lived in Brechin Road Kirriemuir, at Tillyloss with her father and then after marriage in the Tenements. Her father moved next door and both houses are now open to public by NTS as J M Barries' Birthplace, Kirriemuir.
Her gravstone in Kirriemuir Cemetery bares the wrong year for her birth. She clearly was aware of 1818 being correct as in the various Census she reported her age correctly.  Details of her life with the family are well covered in Sandra Affleck's book "The Little Red Town & JMB"