She was a Liberal Party member of the Western Australian Legislative Assembly from 1993 to 2001, representing the electorate of Swan Hills.
[3] Van de Klashorst joined the Liberal Party in 1985, and was a founding member of the Gidgegannup branch.
[2] The pro-choice van de Klashorst played a significant role in the push to reform Western Australia's abortion laws in 1998 after two doctors were charged with criminal offences.
In the subsequent debate, van de Klashorst successfully advocated an additional requirement that women be offered counselling when seeking an abortion.
[4][5][6] Van de Klashorst was Parliamentary Secretary for the Minister for Justice from January 1997 to December 1999, when she was promoted into the ministry after the resignation of Rhonda Parker.