@ChiChidi it could be dumb at first. But realistically speaking. We don't know if this evil force is the evil force that many say. She was summoned by force.
If I were in her position, I would have gtfo of that palace. I would be upset with the slap on the face, cuz the prince did pretty much that, but wouldn't dwell on it. There was another mangas where the MCs, mind you male, left and after leaving the palace they discovered that the good humans were not that great and were just trying to use the power of the so called /heroes/ to take advantage and expand their territories. I am a bit annoyed with the author in making her stay cuz she is a girl and let herself convince by the good knights.
Yes they show to be good people but as someone who has the power , they should have showed a better/decent treatment cuz they need her. I am sorry but she was forced to come to an unknown world and without a way to go back doesn't have the obligation to help anyone but herself. Any other male MC would be in the city exploring, with or without the help of the royal/imperial family, and getting to learn their skills with one or two people.
The first thing you need to do is never trust those who summoned you. You never know if they are good or might be good but will sacrifice the one thing they summon so their people wouldn't suffer. I even got to see another MC, female, that people were good with her but the moment they couldn't do much and remember the MC got the holy power, they threw her to the flames to be a sacrifice since they couldn't kill the demon lord with this summoned person. You are one person but doesn't mean that you were the only one they tried. Who knows if they summoned another before her and didn't work.
I am going to admit that the heroine is a bit slow and is even worse the fake/ second support saintess. I wish they would let them be normal, but meh mangas need to show how cutesy, noble, and friendly girls can be to overcome anything.