A History of Major Margaret (Ross) MacKinnon RN ., BN. is married to a former resident of Canoe Cove , Charles MacKinnon, a grandson of Big Donald. She is the first woman on P.E.I , to attain that rank and the first woman to be appointed aide-de-camp to a lieutenant- governor. Marion Reid , herself a first as the first woman to become lieutenant-governor, chose Major MacKinnon in September 1990, soon after her own appointment.