Tracy was trained in the use of a psychotricorder to perform psychiatric examinations.
In 2266, Tracy filled in for Spock on the bridge while Nyota Uhura was in command during a confrontation with a Shechenag ship. Tracy maintained a long-range sensor fix on Tlaoli IV's Janus Gate, routing sensor data to the engineering and helm stations so that Uhura could enact a rescue plan for Kirk and Spock. (TOS - The Janus Gate novel: Past Prologue)
In 2267, Tracy beamed down to the home of Prefect Jaris on Argelius II. Kirk asked her to conduct a recursive memory scan of Montgomery Scott with her psychotricorder. While she was analyzing Scott, she was murdered by Redjac. (TOS episode & Star Trek 8 novelization: Wolf in the Fold)
- Tracy's height and eye color are those of Virginia Aldridge, the actor who portrayed her. (Virginia Aldridge article at the Celebrity How website)
- Her last name was spelled Tracey in "Past Prologue".