On August 17, 2011, at 13 years old, she debuted for Grindavík's senior in a match against Þróttur Reykjavík in the top-tier women's football league in Iceland.

[1][2] In 2012, at the age of 14 years, Ingibjörg signed with Breiðablik, the record champions in Icelandic women's football.

[4] At the age of 14, Ingibjörg was called for the Icelandic U-17 team, which participated in the qualifying tournament for the 2012 UEFA Women's Under-17 Championship.

Shortly thereafter, Ingibjörg was included in the squad that represented Iceland at the UEFA Women's Euro 2017.

[8] The following season she appeared in three games in the top-tier Úrvalsdeild kvenna before fully focusing on football.