Napa worked for the Business Trade and Investment board, and then as campaign manager for Titikaveka MP Robert Wigmore for four election campaigns.[6] She was later an administrator and spokesperson for the Democratic Party.[7] Following Wigmore's death she was elected to Parliament in the 2012 Titikaveka by-election, which was also contested by her brother.[8][9] In April 2013 she attended the inaugural Pacific Parliamentary Forum in Wellington, New Zealand.[10]
Napa was re-elected in the 2014 election. In 2015, she was appointed opposition spokesperson for Environment, Telecommunications, Tourism, and Youth and Sport.[11] In 2016, she was part of the Cook Islands' delegation to the second Pacific Parliamentary Forum.[12] She was re-elected again at the 2018 election. In December 2019 she was part of a protest by women MPs to permit the wearing of ei katu (floral crowns) in Parliament.[13] In February 2020 she was appointed Democratic Party spokesperson for Health, Environment, Justice, and the Trade and Investment Board.[14]
^Eric Parnis (9 May 2012). "Selina sets sights". Cook Islands News. Archived from the original on 21 June 2012. Retrieved 1 July 2012.
^ abc"Captain's Call: Selina Napa". Cook Islands Women in Sport 20/20. Cook Islands Sports National Olympic Commission. 24 May 2020. pp. 35–38. Retrieved 5 July 2020.