She began a partnership with Gwen Farrar (1899-1944) when they met during World War I; Blaney played the piano and Farrar played the cello. In 1927, she appeared in a short film made in the Phonofilm sound-on-film process, singing "How About Me?" and "He's Funny That Way".
In her later career, Blaney appeared in a number of films and television programmes from 1956 to 1981, including Who Done It? (1956) and the soap opera Crossroads. Blaney died in 1983 at the age of 90.