After her graduation from the Institute in 1933, Maynor received a four-year scholarship to the Westminster Choir School in Princeton, New Jersey.

[1] In 1939, Maynor performed at the Berkshire Festival where she was noticed by Sergei Koussevitzky, conductor of the Boston Symphony Orchestra.

[2] In New York, she was taught by voice instructors William Clamroth and John Alan Haughton.

[4] and at President Dwight D. Eisenhower's 1953 presidential inauguration at DAR Constitution Hall,[5] where the Daughters of the American Revolution famously refused to let Marian Anderson sing in 1939.

In 1949, Maynor was featured in an episode of Richard Durham's radio drama Destination Freedom, with Charmaine Anderson playing her character.