Ms Hamilton has been appointed as Deputy Commissioner of the Independent Commission Against Corruption of New South Wales since January 2007.

In 1978, Ms Hamilton was admitted as a barrister in Queensland. From 1979 to 1982 she worked as a Crown Prosecutor in the Commonwealth Crown Solicitor's office in Brisbane. In 1982, she commenced work at the Aboriginal and Torres Strait Islander Legal Service and was appointed the Service's principal solicitor in 1984. From 1990 to 1995 she held a number of senior positions in Queensland's Criminal Justice Commission. In 1995 she was appointed General Counsel to the Queensland Crime and Misconduct Commission.