Hera said that Hephaestus was the one who made the lovely chariots for Zeus, Poseidon & Hades. Also the one for Helios, the Sun God. And if she married him, he might make one for her too. But she did not tell the young Goddess of Love why none of the Goddesses wanted to marry him in the first instance & that he was ugly & a cripple. She also omitted to tell her that Hephaestus, having created the first woman, Pandora, from clay, had neither the patience nor the inclination to woo & pamper women, let alone put up with the changing moods of the young lovely Goddesses at Olympus. And that even the warlike & down-to-earth Athena had dropped him like a ton of bricks.
As Aphrodite did not appear to have any choices, she nodded her head & thus accepted Hera as her future mother-in-law. And this explains one of the greatest mysteries in Greek Mythology: why the loveliest & most beautiful of the Goddesses would agree to marry the ugliest of the Gods. For this mismatch would not have happened if not for Hera.
