In 2021, she was selected for the 2021 European Athletics Team Championships Second League events held in June in Stara Zagora, Bulgaria.[4] She finished third in the 200 m at the Karlstad Grand Prix in Sweden the same month.[5] Also in June, under the universality rule within the Olympic qualifying criteria which allows smaller nations with developing sports programs to send representatives to the competition, Guðbjörg was confirmed as being selected for the delayed 2020 Tokyo Olympics,[6] but she did not compete at the event.[1]
In January 2023, she twice set a new national indoor record over the 60 metres, first lowering it to 7.43 and then to 7.35 seconds. She was subsequently selected to compete at the European Indoor Championships held in March in Istanbul.[7]