Well, she already lost her chances of winning the Bichirbowl, might as well kill her off
Jokes aside, Camille (fuck you Camyu is a stupid name) had a younger sister who vanished, right? The captured barbarians said they ate her, but from what we've seen they... don't really seem to do that, I assume it was just an intimidation tactic & she lived on & somehow fell into demon hands etc. I'd be genuinely impressed if the author really kills off a love interest since it'd piss people off, but I kinda doubt it. Like even if that really is her, holytits will
asspull a divine miracle & save her, or at least something along those lines will happen... But, again, I doubt that's even really her in the first place, since they just brought up the holy knight dude's brother being one of them moments prior, and a random missing sibling with a strong resemblance feels too specific to be totally irrelevant since all the other abductees were just notable figures who went into seclusion.