I don't wanna defend her or anything since I lowkey hate her too but she's been brainwashed by that annoying prime minister or something
I don't see it that way. You made it very clear that she's being brainwashed. You're clearly ignoring this fact despite the fact that it context of the entire encounter.
The version of her that you see with her sister is the real her. Don't let the brainwashing let you think that she's a horrible person. She's not. She's also a victim.
Oh, wait. That's a different person that made the brainwashing clear. The rest of my point still stands.
Kinda deserved for that princess, she thinks highly about herself but at least she wants to avenger her soldiers.