In Gu Long's novel, why did the Bodhisattva of Great Joy die in the end?

In Gu Long's novel, The Great Joy Bodhisattva, the reason for the Great Joy Bodhisattva's death was not described in detail. The plot of her death in the novel was rather vague, probably because of the suspense left behind by the need for creation. However, from the overall plot of the novel, the Bodhisattva of Great Joy was a legendary character in the novel. She not only had extraordinary wisdom and martial arts, but also could control the power of nature. Although she could live forever, she also faced various risks and challenges, such as her body gradually aging, facing various disasters and dangers, and so on. At the end of the novel, the Bodhisattva of Great Joy did not really die but was saved by a mysterious figure. This plot might also be Gu Long's way of leaving suspense in the novel for the readers to continue exploring the secrets and mysteries within. Therefore, as for why the Bodhisattva of Great Joy died in the end, readers may need to explore and understand it themselves through reading the novel.