At the beginning of the year, Kollanen suffered a knee injury.[1] On 15 September 2018, Kollanen scored all 5 goals in a 5-1 win over Turun Palloseura.[2] On 28 November 2017, Kollanen was announced at PK-35 Vantaa.[3] During the club's 2018 season, she was the PK-35 Vantaa's top scorer.[4]
Tavagnacco
On 20 November 2018, Kollanen was announced at Tavagnacco.[5]
KIF Örebro
On 15 December 2020, Kollanen extended her contract with KIF Örebro.[6] On 30 December 2022, Kollanen signed a contract extension with the club.[7]
Vittsjö GIK
On 22 December 2023, Kollanen was announced at Vittsjö GIK on a two year contract.[8]
International career
Kollanen has been capped for the Finland national team, appearing for the team during the 2019 FIFA Women's World Cup qualifying cycle.[9] She scored her first international goal against Albania on 2 September 2019, scoring in the 26th minute.[10][11] Kollanen scored her second international goal on 8 October 2019, scoring against Albania in the 9th minute.[12] She scored her third international goal against Romania on 22 February 2023, scoring in the 44th minute.[13]