Reborn in 1985: Sweet, Soft, and Sassy

In her past life, her family was ruined and everyone she loved was lost. Her mother taught her to hold on to a sliver of hope for family ties, but she lived worse than a dog or a pig. Now she's back at the age of eleven. What good are family ties? They still want to suck her grandmother's family dry and beat and scold her whenever they please? Dream on! Even when her own mother shows up, she'll give her a piece of her mind. To hell with being lovesick. They say she can barely take care of herself? Her little sister is growing up plump and rosy-cheeked. They say she has to depend on her uncle and live under his roof, watching everyone's mood? Sorry, she's her uncle's investment adviser. They say she's as dumb as a pig, that she can barely roast a sweet potato? Please, ever heard of a top-tier 985 university? But... you, my childhood friend, how could you trick my little sister into calling you brother-in-law?