This Yates family arrived in New York on 19 July 1863 via the ship Cynosure. PEF records indicate that they arrived in the Valley the same year. Name listed in PEF records is "Emma" and "Elizabeth" on the ship.
Birth date is confirmed by her death certificate and Find A Grave website. Her name is "Emma Kay" on the 1870 Utah census and surname is "Boyce" on her death certificate and Find A Grave website. She first married William Thomas Kay and in 1872 she married Peter Boyce.