Being humble probably doesn't do one much good in that place. Humble people might have tougher time defending themselves and taking care not to let anybody get in their way. She would have dropped out without Souma, after all, because she couldn't properly take care of herself. She's adorable, alright, and clearly a great cook, but that particular school might not be the best place for her. Although if she manages to get through it, she might be able to develop a stronger personality as a result.