Prebble became interested in acting at an early age, starring in the stage play "The Magical Kingdom of Thingymijig" in 1993. In the late 1990s she started to work a lot with New Zealand children's TV production companies, with starring and guest roles in several programmes. Her roles included Mandy McFarlane in the second season of "Mirror, Mirror" in 1997, and Trudy in five series' of "The Tribe" from 1999 to 2003. She also guest starred in two episodes of ' as Krista, alongside two of her fellow cast members from The Tribe. In 2006, she began her role in ' as Clare Langtree, the Gatekeeper and Udonna's apprentice.