Whatever she wanted to. She wasn't a real person, so the Greeks didn't see fit to describe her in every detail.
Hades took Persephone to the underworld because of Persephone's beauty.
Queen Persephone is the queen of the Underworld. Hades is her husband and is ruler of the Underworld.
Persephone leaves the underworld in Spring and she returns in the beginning of Fall.
Persephone is both the goddess of Spring and the Queen of the Underworld.
Hades and Persephone had a palace in the Underworld.
Hades took Persephone to the Underworld to be His wife. Zeus (Persephone's father) promised Persephone to Hades as his wife.
Persephone ate of the pomegranate in the Underworld and so had to return to the Underworld every year.
Persephone was not Queen of the Underworld until taken to the Underworld by Hades: afterward, she was never taken anywhere against her will.
the underworld
Hades, the God of the Underworld is Persephone's consort.
Persephone is a Goddess of the Earth, and the Goddess of the Underworld.
Persephone is the Goddess of Springtime, and The Queen & Goddess of the Underworld.