Book Transmigration: Sending a Gift-Bringer to Cultivate Immortality

[No CP + powerful female cultivator + no System + genius protagonist + character growth + wish fulfillment] Gu Mingxi transmigrates into a book as a disposable extra, and worse, a walking treasure chest for the heroine. Since she is here, she might as well make the best of it. In this other world, she is determined to live for herself and stop handing resources to the heroine. Making the most of her talent, she will rise all the way to become an immortal. The heroine? Whoever she is, she can stay away! No one is going to stand in the way of her cultivation! Anyone who tries will be killed, whether god or Buddha!