Is “She participated in political decisions and influenced Di Xin” true?
based on fact
The Book of Documents, in the 'Oath of Mu', records King Wu of Zhou accusing Di Xin of 'heeding only his wife's words.' However, later attributing all atrocities, such as the viper pit and the dissection of a pregnant woman to verify the fetus, to Daji is literary exaggeration.
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.