Well, I usually hate it when an isekai FL does it, but I understand the FL here. She becomes a cold person thanks to her childhood, and she doesn't have the luxury to think about others when she knows she could die anytime if she takes the wrong step, that's why she focuses in their numbers. She had played the games too many times only to die easily in all the LIs' hands, it's understanding that she becomes so anxious. She's just desperate not to die, so she had to think strategically. It's not even the isekai novel world where she can just change the future, the world is controlled by the game's system that even her body is often taken over, keeps on reminding her it's a game which involves her life and death. Also she sympathizes too much with the real Penelope that she bears resentment to some extent to the Duke's family, and finds it hard to accept the Duke's kindness because she thinks it's too late, the real Penelope is no longer exist, and also feels bad to be the one to accept it.
On another note does anyone else dislike when the FL just treats the world as a game? Like sure you can assume its a world based on the game, but youve been transported into that world, the characters respond to you dynamically, have emotions, are sentient-it always rubs me the wrong way when the story focuses on stats and gaining interest from the ml