Kjerstin was born in the year of 1686 in Nedre Ulleruds parish, Värmlands county, most likely on the farm Bonserud. Exact date or where she was born is not known.
On October 29 in 1717 she was married to the widower Måns Andersson from the farm Arnestorp in Nedre Ulleruds parish. Kjerstin lived at that time on the farm Bonserud in the same parish.
After the wedding it is most likely that she moved to her husband in Arnestorp. There she also had their first child, the daughter Britta in 1719.
In the year that their daughter Ingebor was born, 1721, the family were living on the farm Rosendahl in Nedre Ulleruds parish, Vämlands county. In 1833 the family had moved to Nolsjö in the same parish.
There she lived until she died on September 11 1767. She died only five days after her husband.