I checked on "The Long Memory" CD and there Utah definitely says it was Kate Wolf. But that doesn't make any sense becuase the song is years too old for that to be possible.Rosalie Sorrels does make sense as a possibility. She and Utah go way back together.
Kate McGarrigle also makes sense as a possibility. As I said, Utah says in his songbook that the tune is "Gentle Annie," which he heard done by Kate McGarrigle. Also, Utah and Kate McGarrigle both lived in Saratoga Springs at the same time, circa 1969.
Jerry