Olsen has worked with the National Volunteer and Philanthropy Centre and with Beyond Social Services' BABES program for pregnant teenagers.

[citation needed] Olsen has worked in rural Cambodia building sanitation facilities for evacuated communities.

[citation needed] In 2002, Olsen was selected to be the co-host of Singapore's version of the TV game show Wheel of Fortune.

She hosted Rouge in 2008, a talk show concerning Singaporean women, featuring a mix of celebrity interviews and real-life stories.

[15] In August 2013, Olsen founded WomenTalkTV, an online talk show featuring extraordinary women from all over Asia.

In 2020, Olsen hosted a web documentary series, Mundane Glory, which celebrated the 70th anniversary of the founding of the People's Republic of China for Mango TV.

[16] Olsen has represented, in various capacities, commercial brands such as Omega,[17] Motorola Electronics,[18] Goldheart Jewelry,[19] Redken,[20] Nescafé Gold,[21] Shell Petroleum Fuel Save Ambassador,[22][23][24][25][26] BlackBerry Messenger,[27] Physiogel,[28] L'Oréal Lancome Genefique,[29] The Body Shop.

In the 2005 parliamentary debate on Integrated Resort, Olsen called for stronger measures to address the social problems of compulsive gambling, including mandating a loss limit for casino patrons and requiring the casino operator to provide responsible gambling counselling services.

[34] Olsen has been engaged to speak globally on a wide range of topics from women's empowerment to leadership, resilience, and various social issues.

She is a keynote speaker and has spoken at international events such as the Cartier Women's Awards, the United Nations, and LH Forum in France, as well as in educational institutions around the world such as Harvard and universities in India, and in various parts of Southeast Asia including Vietnam, the Philippines, and Singapore.

On 6 May 2020, Olsen moderated an online webinar for Médecins Sans Frontières (Doctors Without Borders) titled "Live Chat on COVID-19: How MSF Responds to a Pandemic.

[38] 7 States has also written a song titled "Light" that they dedicated to the athletes of the 2010 Singapore Youth Olympic Games.

[40] Olsen discovered through a TV program called My Roots that her great-great-grandfather Oskar Pontus Olsson was born in Röra, Orust, Sweden in 1862.

[41] While filming a bicentennial special of Becoming Singapore, she also learned that her grandfather from her mother's side, Yap Swee Kang, was an auxiliary fire service volunteer after World War 2.