Lua Gavin entered as a postulant to the Sisters of Charity at the age of 16. Sister Lua Gavin taught biology at Mount Saint Vincent College and University in the 1950s, 1960s and 1970s. She was also involved with the Alumnae Association. She retired as chairman of the Biology Department in 1979, and in 1982 went to St. Brigid's assisted living in Quebec City, Quebec as a coordinator. Sister Martina Marie was her sister, also in the Mount Saint Vincent community.