Her single "I Will Love You" appeared in the Variety T.I.P.S. (Tune Index of Performance and Sales) Top 100 in 1961. She has been a singer in several movies including Breezy, Snoopy, Come Home ("Do You Remember Me?" (Lila's Theme)) and The Rescuers. Among the songs she performed for The Rescuers, "Someone's Waiting for You" was nominated for the Academy Award for Best Original Song in 1977.
In an April 1995 interview Joni Mitchell recalled that when she began making the rounds of the folk open mic circuit she wanted to sound just like Shelby Flint.
She attended public schools in Van Nuys California including Valerio Street Elementary, Robert Fulton Jr High and Birmingham High School where she graduated from in 1957.