Blane was born in Salida, Colorado. She was the sister of actresses Polly Ann and Loretta Young, and half-sister of actress Georgiana Young. Blane had her film debut at the age of seven when she appeared in Sirens of the Sea in 1917. She returned to the film business as an adult in the 1920s, playing small parts in a number of silent films. Her career continued into the 1930s when Blane appeared in a number of low-budget films, among them Once a Sinner (1930), A Dangerous Affair (1930), Arabian Knights (1931), Annabelle’s Affairs (1931), Hello Everybody! (1933),[2] City Limits (1934), Against the Law (1934), The Silver Streak (1934), and This Is the Life (1935). Some of her scenes, including one in Annabelle’s Affairs, in which she appeared in skimpy lingerie with Jeanette MacDonald and Joyce Compton, were quite risqué for their day, pre-dating the industry’s Hays Code that largely forbade such shots after 1934. The footage from Annabelle’s Affairs is considered lost. Although her appearances tapered off toward the late 1930s, Blane eventually appeared in over 100 films. She appeared onscreen at one time or another with all her sisters, for example with all three in The Story of Alexander Graham Bell (1939). After that, Blane appeared in only four more movies in small supporting roles – Fighting Mad (1939), Charlie Chan at Treasure Island (1939), La Fuga (1944) and A Bullet for Joey (1955). Blane married actor and director Norman Foster in October 1935. In June 1936, they had their first child, Gretchen, named after her sister Loretta Young. They also had a son named Robert. Blane died in Palm Springs, California on August 27, 1997, of cancer (as did her sisters Polly and Loretta) at the age of 87. Blane is interred in Culver City’s Holy Cross Cemetery.