Madge Blake

Madge Cummings Blake (May 31, 1899 – June 19, 1969) was an American character actress. 
She was best remembered for her roles as Margaret Mondello in "Leave It to Beaver", as Flora MacMichael in "The Real McCoys", and as Aunt Harriet in the first two seasons in "Batman". She also played Dora Bailey in the opening scene of the 1952 movie "Singing in the Rain".
Blake was born on May 31, 1899 in Kinsley, Kansas. Her uncle was actor Milburn Stone. Blake died on June 19, 1969 in Pasadena, California from a heart attack, aged 70.