Is “A nine-tailed fox spirit possessed her and caused harm” true?
novel invention
Both the Guoyu (Discourses of the States), in the 'Jin Yu' section, and the Records of the Grand Historian, in the 'Annals of Yin', merely record her as a daughter of the Su clan. The tale of the nine-tailed fox spirit possessing her and causing harm originates from the mythological novel Investiture of the Gods.
Daji
In official histories, she was a consort offered by the Su clan to the Shang king; in fiction, she became a fox spirit possessing a woman and a seductress who brought ruin to the state.