The old granny turned the little white fox into a little girl, so that she may embark on a journey of her own in the world of mankind. Perhaps she would grow up to be more humanly, with the judgment to distinguish vice from virtue, and evil from good. There were good foxes and bad foxes, as there were good people and bad people.
And sometimes, humans were a lot scarier and more complex than a simpleminded fox.
The little white fox arrived at the world of mankind a guileless and naïve child. It was a dismal world plagued by droughts, floods, and epidemics.
The little white fox took pity on the unfortunate, and so she dropped her blood into the well. A gout of blood meant one year of cultivation. Ten gouts meant ten years.
She used all but one drop of blood to save others, relying on the last drop to stay alive.
As a result of using up almost all of her cultivation, her appearance became more humanly, as that of an ordinary little girl.