She was the owner of Le Coeur de Lion, a cafe in the town of Sainte Claire which acted as a front for the local French Resistance cell that Katrine led. Katrine, like Janeway herself, was commanding and authoritative. And, just as Janeway and Seven of Nine frequently disagreed, so did their respective characters in the program. Similarly, Katrine and the bartender of her nightclub were old friends and confidants, just as Tuvok and Janeway had been.
Janeway's real identity was restored by The Doctor; however, she continued to play along with the simulation, unbeknownst to the Hirogen. After disabling the crew's neural interfaces, Seven of Nine and Captain Janeway were able to stage a counter-strike which allowed Janeway to defeat the leader of the Hirogen and return control of the ship to the Starfleet crew. (VOY: "The Killing Game", "The Killing Game, Part II")