Ritchie was cast as Molly, the child lead in the 1986 Nine Network–PBL mini-series "Cyclone Tracy", starring Chris Haywood and Tracy Mann. She started working with "Home and Away" in 1987, at age 8. Production began in July 1987 (shortly before her ninth birthday) and it premiered on the Seven Network on 17 January 1988. In 2006, Ritchie played "Nicole" in the ABC film "Stepfather of the Bride". Whilst promoting "Home and Away" in the United Kingdom in 2006 with Mark Furze and Jodi Gordon, Ritchie appeared on "The Friday Night Project" and "Loose Women", and appeared on interviews for Five and Five Life.