Thanks for looking up the page, Maggie. It says: 26 Feb h. Karin, Pedher Anund i Siul... That's the burial date, and, as you predicted, no patronymic or "last name". It also says how much was paid for the funeral and given to the church.
Actually, the record can also be found at Riksarkivet. They are just not always that clear about where to find marriages and deaths when it's all included in a single ministerial book, filed under birth books.
Piteå landsförsamlings kyrkoarkiv, Födelse- och dopböcker, SE/HLA/1010154/C I/1 (1658-1713), bildid: C0035048_00133, sida 232 https://sok.riksarkivet.se/bildvisning/C0035048_00133
I did take a look at the info on her profile, which seems to be the same as the info on the Geni profile (I'm not sure). I also followed it back to Anbytarforum (by Googling, the link doesn't work) and it comes from a small cluster of speculative notes from a single user, whose reliability I have no means of evaluating. It certainly isn't a peer reviewed publication.
For truly evaluating this a specialist on early Norrland history is needed. I suspect they ar few and far between in G2G.