Plus you can give her the commander ability that allows her to go over max HP limit. Meaning she can end with more HP than she started the fight, so is that much harder to kill.
Plus of course depending on the squad, you get some defensive buffs from other members, and you can always have one super sturdy character run Taunt, to make sure she wont get targettted at least for 2 turns. Depending on the squad that 2 turns might be just enough for her to Crit-Wipe any boss monster that you are fighting, with exception of the most tough stuff out there (none of which is an issue for the Nutaku version anyway any time soon).