Born in 1974 in Hong Kong into a working-class family and brought up on a public housing estate, Lee obtained her Bachelor of Business Administration from the Hong Kong University of Science and Technology and Master of Business Administration from the University of Manchester. She became a professional accountant, working for KPMG in Hong Kong and is currently the principal at CCIF CPA Ltd. Lee first stood in the District Council elections in 1999 for the Kowloon City District Council, the neighbourhood where she lived. She was elected aged 26, the youngest district councillor at that time. She joined the pro-Beijing Democratic Alliance for the Betterment of Hong Kong when she was approached by the former party chairman Tsang Yok-sing around 2004. She was asked to become the part of Tsang's team in the following Legislative Council election in September 2004. She was listed third on the candidate list and helped Tsang to win a seat in the Kowloon West. With her professional background, Lee became a new star in the party and also the pro-Beijing camp. She was elected to the Legislative Council with around 39,000 votes, nearly 19 percent of the vote share, when Tsang left the constituency for Hong Kong Island in the 2008 Legislative Council election. In 2011, she was elected as the vice-chairwoman of the party. In 2012, she was appointed to the Executive Council by Chief Executive Leung Chun-ying. At the time, she was the only person to hold positions in three different levels of representative councils, the Executive, Legislative and District Councils. She served on the Executive Council until her resignation in March 2016, when she said she wanted to focus on her work on the Legislative Council and the party. Her position was taken by Ip Kwok-him, a veteran DAB legislator. In the 2012 Legislative Council election, Lee contested in the newly created territory-wide District Council "super seats". Her ticket received over 270,000 votes in total. On 17 April 2015, she was elected as the first woman to chair the DAB, succeeding Tam Yiu-chung. After Lee was re-elected in the 2016 Legislative Council election, she succeeded Andrew Leung of the Business and Professionals Alliance for Hong Kong to become the chairperson of the Legislative Council House Committee, the second highest office in the legislature. In 2018, she was invited to sit on the 13th National Committee of the Chinese People's Political Consultative Conference. On 18 May 2020, Lee was re-elected as House Committee chairperson. Prior to the vote, Chan Kin-por, the nominee of Legislative Council president Andrew Leung, had taken the seat of the presiding member – a position which had been held since October 2019 by pro-democrat Dennis Kwok – with the help of security personnel, and 15 pro-democratic lawmakers had been removed from the meeting room after scuffles had broken out; during Lee's election, three pro-democrats sat outside the room in protest. After the physical removal of the pro-democratic lawmakers, Lee was elected.
