Duncan was born in Melbourne, Victoria and attended St Columba's in Essendon 1970–76.
[1] In 1999, Duncan was preselected as the Labor candidate for the Liberal-held seat of Gisborne, held by retiring Liberal incumbent Tom Reynolds.
Duncan defeated Liberal MLC Rob Knowles on a swing of nine percent.
Her victory was part of an unexpected swing to Labor in country Victoria that allowed Steve Bracks to win government.
This article about an Australian Labor Party member of the Parliament of Victoria is a stub.