Steina is Jón and Margrét’s daughter and Lauga's older sister. Blonde and brown eyed, Steina is not as beautiful as Lauga, nor as socially adept. Steina's family often criticizes her for failing to complete domestic tasks correctly. Steina is somewhat headstrong and does not hesitate to express her opinions. When Agnes first arrives at Kornsá, Steina recognizes Agnes from a time they met on the road. Steina, empathizing with Agnes, tried to strike up a friendship with her, causing tension between her and Lauga.