Pretty sure her endgame has nothing to do with HERO to begin with, she'd likely still just be doing her thing incognito if she hadn't had to rely on Langdon to get that one item back.I do wonder where she could even find monsters that can deal with the founders.
On a related note, Ella gets pissed and kills the MC in the Bad End where he kills Christie, but Christie should have been fine given the resurrection mark. Did WeirdWorld just come up with the resurrection marks and so it's an inconsistency to be fixed, or does the MC absorbing someone's body actually override the resurrection?
Even if Christie is able to come back it would make sense for Ella to merk us anyway because it's presumably not an easy process and we just wasted a lot of time/resources, or she hadn't applied that yet, either way it doesn't really feel out of left field.