How Can the Beloved Darling of the Family Be Surrounded by Cannon Fodder?

[Fictional period setting + adored by the whole family + transmigrate into a book + family squabbles + childhood sweethearts; a lazy, powerful heroine from the apocalypse vs. a loyal, love-struck hero] Yun Qiao transmigrated into a book, going from the apocalypse to the 1960s. As long as she could get away from those awful nutrient drinks, she was willing to make the trade. But why had she become a newborn baby? That was bad enough, but then she discovered she was the cannon-fodder female supporting character in a period novel she’d read. Even more absurdly, her entire family were cannon fodder, each from a different period novel. Her mother had a crush on the male lead, a sent-down youth, and tried to scheme her way into marrying him, only to suffer the consequences. Her father was a good-for-nothing who married her mother, picked fights with the male lead of a black-market novel, and did nothing all day but loaf around and live off his parents. No one had told her the books could merge. Did that mean she’d transmigrated into three books at once? But events seemed to be unfolding differently. Her mother, who had once been entirely focused on the sent-down youth male lead, now only had eyes for her. And her good-for-nothing father had started trying to better himself. Also, why were her grandmother and uncle looking at her so eagerly? She couldn’t even keep up with all the food they gave her! Even the seven-year-old male lead was crying and begging to have her as his little sister. This plot was all wrong, wasn’t it? Yun Qiao realized she seemed to have become the darling of the whole family! Note: The heroine is from the apocalypse. She’s self-interested, has little sense of morality, and follows her own principles and rules. She’s not a traditional heroine. Please don’t flame the story if you dislike her.