Hell and the outside world are different; women are a rare existence within the Nine Hells, for the Silver Generation had no women.
The women that exist today are mostly demons born later, and although some are powerful, most do not have the ability to be active in the mortal realm.
In this case, a female from hell who could also partake in feasts of gods, while satisfying these three conditions, simply could not be anyone else.
Keto, a sea monster who had once drank the Blood of Heavenly Father, was deceived by the Great Devil Mephisto into becoming his accomplice and later became the True God of false beauty.
Only she met these conditions, and the Golden Apple was significant only for her. "To the most beautiful goddess," which restricted the competition for it to those recognized by all gods.
And now, the Golden Apple that attracted the gods' attention was before Keto, within reach should she extend her hand.
"What is this situation?"