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This is one of the few times I've been really annoyed by quite a few commenters on a manga. I am honestly stunned by their lack of patience for a traumatized girl. It's all still part of one chapter, just separated by parts.
It's not realistic for her to just suddenly stand up to people tormenting her. This isn't a reincarnation or transmigration story. This girl has been traumatized by her stepsister for YEARS and that trauma has been facilitated by her birth father along with her stepmother. She will probably get a backbone as she gains reassurance and confidence from good people around her for the first time since her mother was alive.
I know it's fiction, but still... Would you tell an abused girl to just "stand up" or "get a backbone" for herself when she doesn't even know how? She was ostracized, bullied, and tormented by the others around her with no one to go to for help since she was a very little girl. It's unreasonable to expect her to just say, "Screw you" and leave the house.
I hope the ML treats her really well and shows her the love she deserves, and I hope that bitch of a stepsister gets her very well-deserved comeuppance.