Karppinen developed in the youth department of
Rovaniemen Kiekko (RoKi), an ice hockey club in her hometown of
Rovaniemi. She debuted at the women's senior level with RoKi Naiset in the 2013–14 season of the
Naisten Mestis, during which she played a total of six matches. Over the following seasons, she variously played with RoKi Naiset and the RoKi under-16 and under-18 men's teams. During the 2016–17 Naisten Mestis season, Karppinen served as RoKi Naiset's
alternate captain. In the 2018–19 season, she moved to
Oulu to play with
Kärpät Naiset of the
Naisten Liiga. With Kärpät, she won
Finnish Championship bronze in 2019 and the team qualified for the
2020 bronze medal game before the playoffs were cancelled due to the
COVID-19 pandemic. After RoKi Naiset gained promotion to the Naisten Liiga at the conclusion of the
2019–20 season, Karppinen returned to her home club for the
2020–21 Naisten Liiga season. In addition to playing with RoKi Naiset, she also played 21 games with the RoKi U18 men's team in the 2020–21 U18 Mestis season. ==International play==