Nefja Holmunardottir joins the hird in Skjern after Something To Prove is finished. Just like Ketill, she can't be removed from the party when the party management screen is opened when talking to Skallagrim or when you start the second act of the game.
Nefja is honourable and an assertive woman, unlike her twin sister Eyfura Holmunardottir who plays the classic damsel-in-disstress role due to her unidentyfied illness which is likely to kill her without the proper medical treatment.
Due to her primary statictics, she can be become a great spear and knive wielder who can fight on the front lines due to her endurance being quite high. With her Sense score being four points, she has also access to many support skills.
Nefja Holmunardottir - Default Stats and Equipment