Was trained in opera and was a former chorister at St. Paul's Anglican Church in Vancouver, British Columbia, Canada, when she was a little girl.
When her son, Michael died in 1997, the causes were unknown, although a Santa Barbara Police report contains concerns about possible foul play.
When she was only 3 years old, her father abandoned the family, hence, she lived with her grandparents.
While Margaret lived with her mother in Hollywood, her mother worked as a waitress.
While starring in The Gal Who Took the West (1949), she was not only walking away in the movie, she was actually walking off with Jock Mahoney, who was her boyfriend at the time.
While working as a dancer for showman Nils Granlund at the Florentine Gardens, she was once arrested by immigration officials and deported to Canada. In 1941, Granlund sent a telegram to Canadian immigration officials pledging his sponsorship of her in the United States, and affirmed his offer of steady employment, both requirements to reenter the country.
While working at Vancouver's Palomar, at age 16, she was allegedly pressured to expose her breasts. In response to the incident, she and her mother left the nightclub.
Yvonne and Virginia Mayo toured together, signing and dancing in their later years.