Blair was born in Dallas, Oregon, to Otis Cosper and Nettie Niece. Her first husband Joseph Elizalde died in Santa Barbara in 1917, around the time she began writing screenplays in Hollywood. She later married Sheldon Ballinger; their marriage that ended in divorce. Benjamin Dailey was her third husband; they were married until her death in Los Angeles in 1944.
Career
By 1918, Blair headed up the script-reading department at Triangle Pictures, where she worked on shorts like A Dream of Egypt and A Prince for a Day. She later headed Palmer Photoplays' manuscript sales department and was affiliated with Zeppo Marx Inc. Her last known credit was on This Is the Life in 1935.