Callahan was born Gracie Elizabeth Louisa Callahan on October 4th, 1993, in Durham, Ontario, and was raised in Toronto, Ontario. Gracie started her career with a major role in a Music Video for Toronto artist 'Chico Dusty' as the "Love Interest". After graduating from a 6-month intensive Meisner program at the Robert Mello Studio in Atlanta, Georgia, she returned home and landed a minor role as "Amy" on the Discovery TV Show 'Murder U (2016)'. Following the airing of the show, Gracie landed a lead role on another Discovery Show "Forbidden: Dying for Love" as Jennifer Hyatt. Some of her credits include 'US Weekly's Famous Feuds (2017)' as Holly Madison and a lead role as "Pippa" in the Alumnae Theatre's New Ideas Festival of 'Mourning After The Night Before' by Chloe Whitehorn. She has since been seen in the romantic comedy Christmas movie 'No Sleep 'Til Christmas (2018)' with Odette Annable, Charles Michael Davis, and Alphonso McAuley.