Petra is not foolish, nor is she so disconnected from the world that she lacks even the most fundamental common sense. She's simply been the pampered daughter, accustomed to getting what she wants.
In short, Petra is used to living life according to her own desires.
Petra was strictly controlled and well-protected by her father. If not for the deliberate interference from Yang Yi, an external factor, Petra might have never defied her father's will in her life. But once there's a first time, there will inevitably be a hundredth time of rebellion.
After pondering for a moment, Petra nodded and said, "You're right, I was a bit too hasty."
"See! You really should have a proper talk with your father. Tell him what you think, tell him you do not want to marry Carlson. Your father is willing to do anything for you, of course, he wouldn't want to see you unhappy. So, things could be quite simple, don't you think?"