She has been the Senior Minister of State in the Ministry for Health from 1 September 2013 to 26 July 2020, Ministry for the Environment and Water Resources from 1 October 2015 to 26 July 2020 and Ministry for Manpower from 1 September 2013 to 30 September 2015. She was the Minister of State in the Ministry for Manpower from 1 August 2012 to 31 August 2013, Ministry for Health from 7 May 2011 to 31 August 2013 and Ministry for the Environment and Water Resources from November 2010 to May 2011. She was the Senior Parliamentary Secretary in the Ministry for the Environment and Water Resources from 21 May 2006 to 31 October 2010. She was also Mayor of the South West District from August 2004 to May 2014. She has been the Member of Parliament (MP) for Hong Kah North SMC since May 2011 and was the MP for Hong Kah GRC for Hong Kah North from November 2001 to April 2011.