After being ruled out for 2003–2004 season after tearing her posterior cruciate ligament in the 2003 playoffs, she was hired as the head coach of the team.
In 2010, she was named the 1. deild Domestic MVP after leading Fjölnir to victory in the league and promotion to the Úrvalsdeild kvenna.
In September 2018, she took over as the chief executive officer of Krónan, a discount supermarket chain and a subsidiary company of Festi.
[3] In May 2020, Gréta resigned from the company, siding her unhappiness with the board of Festi applying for and receiving substantial financial relief from the Icelandic government, due to the coronavirus pandemic, despite the profits for the year being projected in billions of ISK.
[7] In June 2020, Gréta was appointed by Kristján Þór Júlíusson, the Minister of Fisheries and Agriculture, as the chairman of the board of the Icelandic Food Fund.