We Were Strangers — Stephanie Rabig

Many people know about the Greek Gods and Goddesses-what most don't suspect is that Zeus and the others had a different home world before they ever came to Earth.
After belief in them faded on our world, they returned to their original home, Storybook, and stayed away from humans for years until a spaceship called the Calypso runs into trouble, and the Deities decide to help.

Completely unaware of the divine intervention, the mortals go about their lives. Simon is banished from the fledgling community for his crimes, Finnian leaves of his own volition, Geneva tries to get her work done while dealing with a controlling husband, and Stace struggles to find something familiar in a world that she was brought to against her will.

Their lives are already complicated enough. And then Hera and Aphrodite decide to make a bet