Mary Johnston
The Johnston family came to Utah in either 1866 or 1869. They likely came in 1866, the year they sailed to America. But the first documentation to place them in Utah is a child born in July 1869. Further research is needed to narrow the year of their travel.
Birth date is confirmed by her death certificate and Find A Grave website and her surname as "Faddis." She married James Pullock Polk Faddies.