Hlín made her Úrvalsdeild debut with Valur in 2015. She played her first game on September 1, 2015, when she replaced Berglind Rós Ágústsdóttir in the 64th minute in a 0–4 defeat against Þór/KA.[1] It would be her only appearance that summer. Hlín's first goal for her senior side came against Breiðablik on August 10, 2017 in a 2–0 win at home.[2]
In December 2020, Hlín signed with Piteå IF of the Swedish top-tier Damallsvenskan.[3] In November 2022, it was reported that she would not play for the team the following season.[4]
International
Hlín debuted for Iceland U17 on April 23, 2015 at 14 years old in a match against Wales.[5] She participated in all the six matches Iceland U17 played in the 2017 UEFA Women's Under-17 Championship qualification.[6] On August 25, 2016, Hlín debuted for Iceland U19 in a match against Poland.[7] On January 23, 2018 Hlín made her first appearance for Iceland senior team in a friendly match against Norway.[8] Hlín scored her first international goal against Denmark in the 2018 Algarve Cup.
International goals
Scores and results list the Iceland's goal tally first.