Because she's like a normal buff woman who's good with a sword but has a magical aura that can wreck undead by dozens. Look at her killstreak.
Yeah, she CAN wreck undead by dozens, so why is she sitting there frozen like a mage who can't move while casting a barrier? Why did she allow herself to get surrounded if she can destroy the undead without getting close? Why didn't she attack the ones controlling the undead?
Welp, time to rewind for a bit;
She's a princess who won a "Royal Capital Swordsmanship Tournament", but when these high school deviants come knocking, not only does she silently cower in the face of... what's his name... Yasuda (yes), but he delivers a kick to her abdomen for free.
Is she not a swordsman? How do you get bodied by teenage degenerates who can't use their buffs against you? How do you get bodied by the dude who looks like a rip-off of dude from Persona 5? You can miss me with this shit.
She's a princess with the IQ of an unborn child, with gear that doesn't mean shit, won a swordsmanship competition that doesn't mean shit, and she's engaging in conflicts with such a cowardly posture that she doesn't even look like she's there to resist.
So many pages and panels wasted on this chick. All they had to say was; "I'm the princess and I want these heroes gone. Do me a solid and get rid of them," erase her character, and nothing would change. But that wouldn't be revenge-porn material. She HAS to be around so she can serve as material to get vengeance for. She's fridge material. Just kill this chara—
Excuse me, you guys can enjoy this for what it is. Don't mind me.