Watson was born on August 2, 1895, in Montreal, Canada, and trained as a physiotherapist at McGill University. Before her marriage, she worked in Toronto and Winnipeg treating Canadian servicemen returning from the First World War.[1]
She first visited Bermuda in 1924 with her husband, Robert B. Watson, a merchant and Royal Canadian Air Force gunner, and the couple settled on the island three years later. They built a home in Paget, where they operated a guest house and small farm. After her husband's death in 1938, Watson returned temporarily to Canada.[1]
In 1939, nearly a decade before entering politics, Watson gained national recognition for her heroism following the crash of Imperial Airways’ flying boat Cavalier en route from New York to Bermuda. She was among ten survivors who endured almost eleven hours in the Atlantic Ocean after the aircraft went down.[1]
Watson was credited with saving the life of the injured captain, Roland Alderson, by keeping him afloat and encouraging other survivors until rescue arrived.[1]
For her actions, she received the Royal Humane Society’s Silver Medal for "saving life at great personal risk", presented later that year by the Governor of Bermuda, Sir Reginald Hildyard.[1]
Later that year she enlisted in the Canadian Army Medical Corps, serving as a physiotherapist in England and Italy during the Second World War.[1]