Nox's Force powers are too much for her. With his telepathy he's mind tricked whole groups of Sith and his lightning is some of the strongest around. He trashed Thanaton, who I'm honestly not seeing as below Jaina in the Force in any respect. Jaina just can't compete with Nox in this department. By contrast, Nox is an excellent swordsman who can give Jaina a great fight in that department, at least holding out well enough to bring his Force powers to bare and ultimately wasting her.
Jaina's strength in the Force shines in internal amplification and augmentation, in which she cleans house with either Nox or Thanaton. Caedus couldn't one shot her and if a potentially Tier 10 Sith Lord can't stomp her then Nox doesn't even come close.
Caedus is magnitudes more powerful than Nox by a severe degree and it's clear that on the occasions Caedus was focusing Jaina she was not outmatched at all.
Jaina solidly wins.