What is Hera's motivation during the Illiad?

Google Judgement of Paris

She was snubbed by Paris after a crazy girl threw an apple at a party.

>>8254410
Why doesn't she stop Aphrodite from helping Paris during his duel with Menelaus?

It's the end result of a long spiteful family feud between Hera and Aphrodite. Hera, in order to assume authority as the matriarch of the Olympians, had to sacrifice an aspect of her feminine sensuality, the youthful girlish playfulness and glamor that Aphrodite revels in and flaunts wherever she goes. It's this sensuality that Aphrodite used to seduce Paris into choosing her beauty above Heras, even though Hera truly was more beautiful, she just carried it with a Queenlike motherly demeanor that didn't appeal to the sexual desires of Paris.

She had also been at odds with Aphrodite over the affairs she had with her son Ares, as she was married to her second son Hephaestus. Hera is the Goddess of the domestic household and the covenant of marriage, where Ares and Aphrodite were the patron deities of passionate love affairs

>>8254429
The Olympians made numerous moves to hamper one another from assisting their favored mortals through the Trojan War

>>8254391
I thought it was just because she was a cunt