Evidence from emigration and genealogical records proves the Thompson family traveled to Utah in 1861. The Mormon Immigration Index lists this family under the surname of "Nielsen" in the on the 1861 Monarch of the Sea ship register.
She is married as Maren Mortensen to Peder Nielsen in Lendum Parish. She is born Maren Mortensen daughter of Morten Jensen and Anne Christensen.
The family came on the ship Monarch of the Sea in 1861. The family consisted of: Peter, father, mother Maren, and children: Cecilia M., Maren, Mouritz Chr., and Niels Andreas.