Britha Hansdatter Winjum/Vinjum - Aurland

I have an ancestor named Britha "Betsy" Hansdatter who emigrated to the USA from Finnas with her husband Anfin Ericksen Henjum in 1847. They had previously lived in Leikanger and got married there. However, Britha died while in the USA at a reasonably young age in 1863 (likely due to childbirth complications), so not too much was known about her by her children. In fact, even a family bible in old Norwegian had a verified mistake about her parents. I am looking to find out more about her ancestry, perhaps from the Aurland bygdebok or some other source. Here's what is known about her for sure: birth: 05 Feb 1823 Vinjum, Aurland, Sogn og Fjordane, Norway baptism: 23 Feb 1823 marriage: 29 Sep 1846 Leikanger, Sogn og Fjordane, Norway parents: Hans Hansen(?) Vinjum & Anna Thoraldsdatter Nothing is known about her siblings or parent's families. This is what I am most interested in. If anyone knows where to find out more about the Vinjum/Winjum far, that would also be wonderful. Many thanks, Sean PS: Her husband Anfin Ericksen Henjum has been traced back pretty far using the Leikanger Bygdebok.