[2] In the 2018 Damallsvenskan season, Karlernäs's 11 goals from midfield helped Piteå secure the League title and won her the Most Valuable Player award.

[4] On 30 August 2018 she won her first cap as a substitute in a 3–0 2019 FIFA Women's World Cup qualifying win over Ukraine at Gamla Ullevi.

She won a second cap and made her first start for the national team in October, in a 2–1 win over rivals Norway.

[5] Karlernäs has competed in the UEFA Women's champions league with Piteå IF in 2019 and with BK Häcken in 2021.

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