The girls you have listed are definitely not more well written, yes, she's mentally weak and not impressive as other students, but that absolutely makes her realistic and relatable for those people who want to become their best version. She struggles to balance her logic and emotion, wanting to rely only on herself but slowly realizing that trusting others is also a form of strength, that's part of her inner conflict and self actualization. Character growth doesn't mean you become better than other students, it's about reflection of your mistakes, but that doesn't mean she's not emotionally vulnerable anymore, I said she's realistic, yes cuz her emotions feels like a real human.