In her next incarnation, Ollistra was a part of the War Council, and was at the forefront of the Time Lords' efforts against the Daleks during the Last Great Time War. Initially, she tried to get the Eighth Doctor to join the ranks, (AUDIO: Echoes of War, The Conscript) and by the time he regenerated into the War Doctor, she actively joined him on several missions, much to his chagrin. (AUDIO: The Innocent, et al.) During a period this incarnation was away from Gallifrey on the front line, her previous incarnation was brought back as a Matrix projection to lead the War Room. (AUDIO: The Passenger)
If a medium is not mentioned, then this incarnation did not have companions who were original to that medium; it does not mean that this Doctor failed to appear in that medium.