Boyd graduated as a physician in 1918 from the University of Toronto Faculty of Medicine, where she had been the Undergraduate Medical Women's Council's director. She began a fellowship at the Hospital for Sick Children in Toronto in 1920 and was appointed the director of Endocrine Services in 1921. In that role, she conducted research in the treatment of juvenile diabetes, nephritis and tuberculosis. In 1922 she was appointed Chief of Paediatrics at Women's College Hospital, and was the sole paediatrician at the hospital.
