Mary and her husband John sailed to America in 1849 on the ship Berlin, accompanied by Myra Williams. We have not been able to determine if she was a family member or a friend.
John died on 22 September 1849 while crossing the ocean. (see the Journal History article at https://catalog.churchofjesuschrist.org/assets?id=27c27cf1-1319-4c97-b505-06ca11485a7b&crate=0&index=270)
Evidence from emigration, the 1850 census (taken in the Spring of 1851), and church records proves that Mary traveled to Utah in 1850. Further research is needed to determine the name of the company with which she traveled.
Mary was rebaptized in Salt Lake City on 11 July 1851, prior to the arrival of that season's emigration, again proving that she arrived in Utah in 1850.