Charlotte should just go "gimme all your mana" and do her thing.
Okay, no, I'm really frustrated because she's being looked down continuously and can only do a little magic, while she was the most powerful mage in history before. But if she were to do that (get mana and deal with all this shit) then it would be such a deus ex machina, I would be disappointed.
I... I just want this frustration to go away already! x3