Blakeney made her screen debut in England in 1932.[citation needed] In the early 1910s, she acted with the Pittsfield (Massachusetts) Stock Company.[4] In 1914, she was engaged with the Lucille La Vernestock theater company.[5] After working as William Gaxton's partner in vaudeville, she acted on stage in England. While there, she helped to introduce the play Broadway to British audiences.[2] Her Broadway credits include The Royal Family (1951) and The Browning Version / Harlequinade (1949).[6]
Blakeney portrayed Mrs. Alice Aldrich, the mother of Henry Aldrich, in eight (seven of which were consecutive) films about The Aldrich Family. (She played a related role, Mary Aldrich, in a ninth related film, Henry and Dizzy.)[7]
Blakeney died at the age of 65 due to complications of cancer on October 21, 1959, in Encino, California. She was cremated and interred at Forest Lawn Memorial Park, Glendale in California.[1]