Dalen grew up playing on boys' teams in
Ringerike, Norway and with women's teams of
Vålerenga Ishockey. In 2009, she moved to Sweden to attend the ice hockey
gymnasium of
Linköping HC and play with the club's
women's team in the (renamed Swedish Women's Hockey League in 2016). She led Linköping to a runner-up finish in the 2011 playoffs, while finishing as playoff scoring champion with seven points in four contests. In the regular season, she finished sixth in the scoring race. By the end of her two seasons in Linköping, she had scored 81 points in 54 games, including 50 goals. Dalen joined the
North Dakota women's ice hockey program in September 2011, joining fellow Norwegian
Jorid Dagfinrud. Across 143 games with North Dakota, she scored 63 points, serving as the team's captain in her final season. After graduating, Dalen returned to the the
2015–16 season and signed with
Djurgårdens IF Hockey. In her first Djurgårdens, she set the league record for goals in a season after scoring 47 goals in 36 games; she ended the season with a total of 73 points and twelve penalty minutes. In the
following season, the team won the SDHL championship. She was named Djurgården's captain in 2018 and served in role for three seasons, until signing with Linköping HC for the
2021–22 SDHL season. Following her season with Linköping, Dalen opted to sign with
Frölunda HC, a team founded in 2022 and helmed by general manager
Kim Martin Hasson. As a newly established team, Frölunda was required to play the in the
Nationella Damhockeyligan (NDHL) but the team made it clear that the goal was promotion to the SDHL at season's end. Led by SDHL stars Dalen,
Michelle Karvinen,
Hanna Olsson,
Sarah-Ève Coutu-Godbout, and
Stephanie Neatby, the team quickly rose to dominance and earned promotion to the SDHL in March 2023. In addition to scoring the first goal in team history, Dalen ranked third of all players in the NDHL and on the team for points with 97 points from 53 goals and 44 assists in 27 regular season games – a scoring pace of 4.1 points per game pace and just one goal shy of 2 goals per game.
International Dalen represented her native Norway in the Division I tournament of the
IIHF Women's World Championship in
2009 and
2011. She registered four goals and one assist in 2009 tournament, helping Norway finish third in their division. At the 2011 tournament, she tied for fourth in tournament scoring. Dalen played for Norway at the
2011 IIHF 12 Nations Tournament. She ranked second in Group C scoring with 6 points, only trailing teammate
Helene Martinsen whose 8 points led all players in the Group C tournament. ==Awards and honors==