The Doctor managed to find her and gave her biometric handcuffs he had gotten on Inkarsera, from where the Extron had escaped. While it was attempting full gene transmutation using her energy pattern, she put on the handcuffs, which transported the Extron back to Inkarsera. The Doctor then returned Violet home. (COMIC: The Monster Upstairs)
Multi-adventures reference the rare instance when a companion is shown or stated to have multiple adventures with the Doctor but only appears in a single story.
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.