Susan was elected as a Harrow Councillor for Hatch End Ward in 2006.  She was given a Cabinet position responsible for the Environment and Community Safety in 2007 and became Deputy Leader of the group in 2008. Susan became Leader of the Conservatives in 2010 and Leader of the Opposition, she took over as Leader of the hung Council in 2013 returning to opposition Leader in 2014. In June 2017 Susan became a London Assembly Member and stood down from Leading the Harrow Conservatives. She became Deputy Leader of the GLA Conservatives in 2018 and Chairs the Economies and Fire Committees as well as serving on Budget, Police, Education and Health Committees. In December 2019 she became the Leader of the GLA Conservatives.

Her passion lies in Community Safety in all its forms. She was appointed to the London Fire and Emergency Planning Authority in June 2010.