If I'm understanding what everyone's saying correctly, the original heroine is not just a good & kind person, but also not a two-faced bitch fellow reincarnator?
THANK FUCK. I'm not against the premise as a whole, but goddamn it sure does feel like that trope has become excessively common nowadays for the sake of having an obvious villain in the story. It's nice to have a story where only one factor is changed (the MC improves things for the former villain(ess) & changes them/their life for the better) without also changing the original hero(ine) into a scheming (& often kinda pathetic) bitch who solely acts out of a sense of entitlement & acts drastically different than the character was supposed to the instant they're out of view of the people they're trying to manipulate. Some stories pull it off well (looking at you, The One Within The Villainess), but it really shouldn't be so common... Let the original protagonist show off their original-protagonist-ness, dammit!