Career
She has been an Australian Labor Party member of the Legislative Assembly of Queensland since February 2000, representing the electorate of Bundamba. Miller entered parliament in a 2000 by-election upon the resignation of the former member for Bundamba, Bob Gibbs. Bundamba is considered a safe seat for the Labor Party, and Miller has been re-elected since.
On 16 February 2015 she was sworn in as Minister for Police, Fire and Emergency Services and Minister for Corrective Services in the Palaszczuk Ministry.
On 4 December 2015, Miller resigned from cabinet following a Queensland Parliamentary Ethics Committee Report stating that although she had not been guilty of contempt of Parliament, she had engaged in a "pattern of reckless conduct." The committee"s investigation focused on revelations Miller had signed a document stating she had correctly disposed of confidential Parliamentary Crime and Corruption Committee papers, which were later found by an Opposition Member of Parliament in a safe used to store those papers. Her resignation came one day after Premier Annastacia Palaszczuk signalled her intention to remove Miller from her portfolios.