Maybe it's because I grew up an only child, but did anyone else feel that was resolved too easily? Regardless of the sister's actual motive, she abandoned her family without expressing the reason. She left her little sister feeling hated and incredibly doubtful of herself for however many years. Now that the little sister has made a full resolve, proudly, to take care of the shop, older sister waltzes back in and claims that she's taking over, rendering the little sister's effort and pride practically irrelevant. I believe older sister deserves to be chewed the hell out for an extended period of time, at minimum, for trying to pull that crap and twist a child's emotions like that, regardless of if it was intentional or not.