My problem is that Cold Fire ends with Janeway promising to find Suspiria again. And then... Nothing. That's the end of it. They never mention the Caretaker's mate again. Particularly as Voyager clearly became about the crew finding their way home, I would have thought it'd be something they'd talk about on occasion, even if the crew had decided they'd traveled too far from the area around Ocampa to reasonably believe they'd be able to find her again.
Honestly, I think it would have made a better finale if, instead of the Transwarp Hub, they'd discovered the Borg had captured Suspiria, then building the finale around that. Not only would it have resolved this lingering plot thread that existed from literally day one, it would have been a better bookend for the series.
Plus, on a more superficial note, it'd better justify naming the finale 'Endgame,' since it'd at least give an impression that they were attempting to build to this result...