She is known for her writing: she copied letters and documents from the Middle Ages, the originals of which have since been lost, and for her genealogical research.
[2] In 1562, she married the noble Erik Månsson Natt och Dag, son of Måns Johansson and Barbro Eriksdotter.
After being widowed shortly after, she managed the estate Brokind Castle on behalf of her minor son Erik Eriksson Natt och Dag (d. 1566).
[3] However, Grip did serve as Karin's temporary Mistress of the Robes directly after Karin became queen in 1567, when she was summoned by the king himself "without any opposition travel to us [...] and bring with you the little maids you have staying with you [...] set all other excuses aside", likely in order to enhance the status of the new commoner queen.
Genealogical research became common among the nobility in the late 16th century, but Grip are regarded as the pioneer of this genre in Sweden.