• This is possibly Jennett (19); wife of William in the British Mission Record (as seen on Mormon Migration) as scheduled to sail on 1864 General McClellan. However, the ship passenger list only shows that Janet actually sailed. She is seen to be traveling alone according to Warren company records as well. Further research is needed to identify who she was. 

William S. Warren Company (1864)

• Age at Departure: 19

Sources

• Captain William S. Warren Company (third ox train), manifests, 1864.
• "List of Passengers," Deseret News, 17 August 1864, 369.
• New York Passenger Lists, 1820-1957.
• Saints By Sea: Latter-day Saint Immigration to America