Torrey was a hologram, based on B'Elanna Torres, that was a character in a holonovel written by The Doctor entitled Photons Be Free.

In the novel, Torrey was a Human and the chief engineer of the USS Vortex. She was very hard on her team in Engineering, constantly insulting them. She refused to allow the EMH character to enter Engineering, and told the EMH that it was a tool, and could be replaced as easily as a hyperspanner. She was married to the ship's helmsman Lieutenant Marseilles, a character based on B'Elanna's husband Tom Paris, who was nevertheless a womanizer. (VOY: "Author, Author")

Torrey was played by Roxann Dawson.
According to the final draft the episode's script, Torrey was originally named Torat.
From the Star Trek Encyclopedia (4th ed., vol. 2, p. 408), "Photons Be Free was presumably published sometime after the conclusion of the episode, albeit in revised form. We suspect that the final version of the character was less like Torres and may even have had a different name."
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