Dato' Dr. Lee had a distinguished career with the Royal Malaysia Police ("RMP") for 34 years in various departments. She holds the National Record in the Malaysia Book of Records for being the First Chinese Woman Commissioner of Police in the RMP. During her tenure with RMP, she held various important command posts and management positions including as Chief of IGP Secretariat (Research & Development) at Police Headquarters Bukit Aman and Head of Centre for Intelligence and Strategic Studies at the RMP's College, Cheras. 

From 2013 to 2018, Dato' Dr. Lee was attached to the Ministry of Home Affairs ("MOHA") as Chief Executive Officer of the Institute of Public Security of Malaysia ("IPSM") and Director of Centre for NBOS, IPSM. She was actively involved in international and national events as event organiser for Putrajaya Security Dialogue-Putrajaya 2014, Forum on Crime and Policing-USM Penang 2015, 1st and 2nd Putrajaya International Security Dialogue in 2015 and 2018, International Conference on Deradicalisation and Countering Violent Crime-KL 2016, Seminar Keselamatan dan Ketenteraman Awam (SEKAM)-UMS Sabah 2016, International Conference on Rohingya-Putrajaya 2017 and International Conference on Security and Strategic Cooperation (ICSSC)-KL 2018. She was also involved in formulating and drafting policies and standard operating procedures ("SOP"), among others, Internal Security Policy in 2016, SOP on Autism for RMP in 2019 and SOP on Duties and Responsibilities of Detectives for RMP in 2021. She had held various positions in social activities, such as Chairman of Police Women's Management of Development Committee, RMP (2020-2021), Chairman of the Buddhist Prayer's Committee, RMP (2020-2021), Organising Chairman for the setting up of Police Autism Central at Pulapol, KL (2020-2021) and Editor-in-Chief of Journal of Public and Safety, MOHA (2014-2018). Dato' Dr. Lee had numerous publications issued as far back as 1986 and the latest publications in 2021.

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