Isobal's name does not appear on the 1850 Utah census. The first documentation to place her in Utah is her rebaptism in Salt Lake City, which took place 14 July 1852. This was prior to the arrival of that season's emigration, so it is likely that she arrived in Utah in 1851. Further research is needed to confirm the name of the pioneer company which she came to Utah with.
The Salt Lake Stake Record of Members confirms her date of rebaptism, her birth date and that she was born in Scotland.