Lydia Ann Davis

A history of Levi Orson Alamander Colvin, written by himself, states that he came with his wife (Mary Ann), wife's mother (Sarah Ann), and her younger sister (Lydia Ann).  This document can be seen with his entry in FamilySearch (K2MS-ZJM).

Her birth and death dates are confirmed by the inscription on her gravestone.  The 1870 and 1880 Utah census shows her name as "Lydia Ann Davis Morrill."