I've Killed Zombies Before, Why Am I Afraid of a Group of the Best?

In the twelfth year of the apocalypse, Shen Nianqing killed ten million zombies, and the system sent her back. When she opened her eyes again, she was eleven years old again. My father has not yet been dragged down by his stupidity and filial piety, my mother has not yet been tortured to tears, and the family of three has not yet reached the stage of ruin. Shen Nianqing touched her chest and smiled. Twelve years later, I finally have the opportunity to settle the score myself. The eccentric grandpa, the vicious stepmother, the cunning slave who deceives the master, and the whole family's blood-sucking master...