Born in Bærum on 23 February 1966, Trøen is a daughter of factory manager John Willy Wilhelmsen and secretary Anne-Marie Christiansen.

[1] After the Solberg cabinet's defeat in the 2021 election, Trøen became the chair of the Standing Committee on Health and Care Services.

[7] In September, after several media revelations of MPs misusing parliamentary commuter homes and the severance pay scheme, Trøen announced that the Storting presidency would be looking into the matter.

A revelation of the former later lead to the resignation of minister of children and families Kjell Ingolf Ropstad.

[8] A few days later, it was also revealed that Trøen herself also had misused her parliamentary commuter home by allowing her son to utilise it as a student dormitory.