Gunnild Olsdatter

I am looking for information for Gunnild Olsdatter. I know she had a child with Andrew Severson(Anders Sjurson(Hundere)) born June 20, 1846 in Sognal, Sogn Og Fjordane, Norway. They never married and the son Ole came to the U.S. in 1854 with his Aunt Mette Dorthea Sjursen. Father Andrew had emigrated in March of 1846. I cannot find out anything about Gunnild other than the birth of her son. Would like to find out anything about her. When she was born, parents, did she ever marry, death, etc. Hope someone can give me some information. Thanks.