Her career started at the tender age of five when she performed as a guest vocalist on Guy Mitchell's "If You Ever Go Away." Throughout her childhood and teen years, she studied music and worked in commercials.
During her teen years, Hafer joined her mother, Mary Mayo, as a member of the Hillside Singers. In 1971, Hafer recorded the lead vocal for the Hillside Singers' runaway hit "I'd Like to Teach the World to Sing." After the group ended, she attended London's Royal Academy of Dramatic Arts, and in the mid-1980s was asked to join the Glenn Miller Orchestra for their world tour.
In 1981 she met and married her husband Mike Hafer. She has released solo albums including 2005's "Lucky To Be Me" as well as the couple has released albums together. They still perform together live and makes numerous media appearances. The duo is also part of the Music of Your Life Trio.