Quintal was one of the first ten women selected to join the
Singapore Police Force, undergoing training at the
Thomson Road Police Training School. She joined the
Singapore Police Force on 1 March 1949 as a constable, and was promoted to the rank of inspector six months later, becoming the first female inspector in Singapore. In 1950, she was chosen to go on a four-month trip to the
United Kingdom to study police methods in Great Britain. She participated in the investigation of the murder of Lim Yew See in 1955. By 1959, she was the only one of the original ten women to have remained in the force, and commanded the Woman Police Constabulary. In October 1961, Quintal was promoted to the rank of Assistant Superintendent, making her the first woman to achieve the rank in Singapore. Following her retirement, her position as Assistant Superintendent was taken over by
Mandy Goh, who joined the force in 1952, thus making her the second woman to hold the title of assistant superintendent of the police in Singapore. ==Personal life==