Did the Goddess Go Traveling Today?

The plot and character personalities are all my own interpretations. The protagonist is much older than the anime characters, so there won't be any anime plotlines. I'm a beginner and write pretty casually, so please don't scrutinize the content too closely. Just enjoy it without overthinking.

Luo Li is a little girl suffering from a terminal illness. By chance, she learns that mysterious powers exist in the world, and that her illness is incurable because her own power is too strong for her body to bear. When a little fox appears before her and says it can take her away so she can live on in another world, she agrees without hesitation. When she opens her eyes again, she has become the youngest daughter of the Byodoin family...