Sort of. Nox slipped through during the slave rebellion, etc along with all other Empire protagonists. The problem being that all of these stories don't overlap the entire time. The state of things during these differences makes saying "Nox also fought an army," not as accurate a statement. The same could be said of the Wrath. Given that Nox meets Kallig when he was still very much causing issues, I wouldn't be surprised if they got to Kaas the last out of all the protags.
No, Nox fought through a different army: Skotia's Guard. You can read about it here.
The bonus quest for the mission states: "Darth Skotia has amassed an army-sized force of followers in his hidden bunker beneath the colossus. Dispatch these forces in the hidden bunker and stop the underground operation. "
These followers are made up of at least 1 Sith Lord, Sith acolytes/apprentices, droids and (maybe) soldiers iirc.
Nox is (weirdly) underestimated. She's not just powerful because of the ghosts, she's a massively potent Sith in her own right.