In the 2010 Úrvalsdeild kvenna playoffs, Stella suffered a blow to her temple and was knocked out. In November 2013, Stella suffered a blow to her left temple, in a game with the national team, that resulted in a concussion, memory loss and a temporary loss of sight in her left eye. In January 2014, in a game with SönderjyskE she suffered another blow to the head that worsened the symptoms.[4][5]