- References from numerous sources establish that the various depictions of the mirror universe may not take place in concurrent timelines, meaning there could be a number of divergent alternate reality versions of this topic that do not share the same continuity. The references below this note are separated into subsections to minimize confusion regarding the divergences.
In 2374, she crossed over universes to the counterpart reality and kidnapped James T. Kirk, and along with Spock forced him to realize how his advice to Spock had backfired, and Kirk agreed to help the rebels. (ST - Mirror Universe Trilogy novel: Spectre)
In the 2370s, Janeway had secured a position working in the Rebellion, but was operating undercover for the Klingon-Cardassian Alliance.
By 2371, Janeway was serving as chief engineer aboard the Geronimo under Captain Chakotay. During her time aboard the Geronimo she was also Chakotay's lover. (VOY - Obsidian Alliances novel: The Mirror-Scaled Serpent)