Lennie was a student of Charles Marega and was in the first graduating class of the Vancouver School of Decorative and Applied Arts in 1929 where she was interested in costume design and sculpture. After graduation she went to the California School of Fine arts in San Francisco where she studied with Diego Rivera. When she returned to BC, she became a teacher of sculpture and modeling in the short-lived BC College of Arts from 1933-35. In the late 1930s she established her own art school for a time at 13th and Granville. In 1940 she began teaching at Crofton House School for Girls where she remained until her retirement in 1970. She continued to exhibit and take on commissions during that time. She also worked as a tour guide for Wrights Travel Service in 1961. An article in the Vancouver Sun (May 21, 1960), calls her "witty and fun-loving." She made fun of the public conception of a sculptor as "a muscular person with a red beard." For Lennie, sculpting required a "gentle attack, stamina, and stick-to-itiveness."