Off topic a bit, but you are right, I can not see a single source with her surname mentioned. However she has a brother with the same surname, maybe he gives some clues to where the name comes from. Did only the brother take the name and the siblings might only have been known by the patronym? There was a lot of girls in the family, they didn't always go by the taken name of their father, if he indeed took the name Lundhök. If that is true you can kinda see why Lund is part of their name, since the family came from Lund. Sadly female family members were not always referred to in records by their full name, in her death record it only says Anna widow of Möller.