Gudrudur Gudmundsdottir was born 15 February 1835 at Thorustadir, Mosfellgrimsnesi, Akraneskaupstadur. Her parents are Gudmundur Tomasson, born 28 August 1796 at Helludalur, Haukadalur, Arnes; and Thorunn Stefansdottir, born 5 August 1795 at Nedridalur, Haukadalur, Arnes. She married Gudmundur Egilsson 26 October 1873 in Reykjavik. They met Mormon missionaries and became members of The Church of Jesus Christ of Latter-day Saints, being baptized by Elder Jacob B. Jonsson 8 January 1881.
In July of 1881 Gudridur, Gudmundur and their son Eirikur left Iceland with Elders Jon Eyvindsson and Jacob B. Jonsson and a group of about twenty Icelandic Latter-day Saints. They arrived in Salt Lake City 7 August 1881. They then went to Spanish Fork, Utah. Gudridur and Gudmundur bought land in Spanish Fork. She died 14 December 1925 at Mapleton, Utah. She is buried in the Spanish Fork City Cemetery. She was also known as Gudridur Tomason.