Since you seem to have read the novel, could you please spoil just one thing for me?
Does Judith show up in future arcs? I've seen people discussing the novel in ways that suggest that she just disappears from the story after this, which would be utterly depressing
Unfortunately she does disappear from the story. But for what it's worth, I doubt the author has forgotten about her.
Most of the future arcs take place in a state where she cannot be present for understandable reasons. After that situation resolves, she's still not revisited but I believe they're only up to the 2nd "save & reset" of the current arc. A lot can still happen from here on, based on how whack the arcs before were.
So before, she killed him instantly with the quickness several times...but now she couldn't do diddly squat against his weak defense and cries on the floor like a loser instead?