Career
She currently plays for the Portland Thorns Football Club and the Iceland national team Dagný started playing football when she was six years old, with her first club, KFR from Hella and Hvolsvöllur. She played for them in 2006 as they competed in a joint effort with Ægir from Þorlákshöfn.
Since 2007 she has played for from Reykjavík in the best women"s league in Iceland, Úrvalsdeild.
In 2011 Dagný began attending Florida State University and began playing for Florida State Seminoles. Dagny is known for her poise and talent on and off the field
She returned to Iceland to play for during the summer months. In 2014 she played for University of Medicine and Pharmacy Selfoss.
In 2015 she signed for the second half of the season to German Bundesliga team Bayern München.
In October 2015, Portland Thorns Football Club announced that they had acquired her. Dagný made her debut for the senior Iceland national football team at the 2010 Algarve Cup. In a 2–0 defeat to the United States on 24 February 2010.
She was called up to be part of the national team for the Union of European Football Associations Women"s Euro 2013.
In Iceland"s final group match against the Netherlands, Dagný headed the only goal of the game to secure her team"s place in the quarter-finals. lieutenant later emerged that she had played the game with a broken foot, sustained in the previous match against Germany.