Kristoffersen moved to Longyearbyen from Tromsø in January 2009, along with her family of husband and two children, to work at the University Centre in Svalbard. By 2011, she was a board member of the school board, the board of city operations and the port authority. Ahead of the 2011 election, in May 2011, she beat Anita Johansen with 15 against 5 votes to become the Labour Party's mayor candidate. Her party won 43 percent of the votes and she was subsequently elected mayor, replacing Kjell Mork. She sits in the municipal council along with her son, Viljar Hanssen, also for the Labour Party.
- Ylvisåker, Line Nagell (3 May 2011). "På topp for Arbeiderpartiet". Svalbardposten (in Norwegian). Archived from the original on 16 March 2012. Retrieved 16 March 2012.
- Amundsen, Birger (10 October 2011). "Kvinne valgt av folket". Svalbardposten (in Norwegian). Archived from the original on 16 March 2012. Retrieved 16 March 2012.
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