As if ending a war would make her less scary to the people who don't know her 😡
They might become outwardly less mean to her, and force themselves to talk with her because she would gain status, but it would only reinforce the stigma that she's dangerous.
And the king who keeps insisting that it's all up to what the two 14 yo girls whether they go to war or not is complete bs. For one, they're 14! That's not old enough to make a rational decision (no matter how mature either of one might be), for another how the hell do you refuse that kind of request from a king? Especially when he's summoned you personally to his throne room? If he wanted to make it a request they could refuse he'd have to make it more private, and ask them separately, the pressure of expectations here is insane. The light spirit girl can only refuse like that because she thinks plot armour is a real thing for her in this world.