You'd have to disable all items 'cause Yuuka stands above the ways of a cheating Amanojaku.
But to be honest: I actually have a hard time figuring out a reason for Yuuka to just go out and beat up the lesser youkai to then provoke the others or why people would just pester her with weird spellcards.
But in the end ISC doesn't have all that much dialogue and also no "scene comments" like StB and DS had so whatever is said in-game can easily be bent to suit any character if you put some thought into it.
