Jill made her movie debut in 1989, playing the role of Nikola Dobson in the Biker Grove television series, in which she played in 29 episodes until 1992. In all, Happenny played in 26 films and television series. Since February 3, 2007, Jill has been married to actor Craig Conway, whom she divorced in December 2010. The couple have a son - Harvey Rhys Halfpenny.