The Eldest Princess Is the Darling of All

Wei Shunian has transmigrated into a book! She's become the cannon-fodder female supporting character. Her father dies from the start. As a cannon-fodder princess, she knows her fate is a grisly death, so she decides to fight back and change her ending. The hero and heroine have protagonist halos, but she has a golden finger of her own. It's still anyone's game...