Did she (gasp!) kiss a boy, or just flirt with one? .....or did someone merely accuse her of doing so?
Most likely she was raped by some older man. She was only a child -- it would be rape even if it was consensual.
She got raped. You know how it is in Islamic Republics - if a woman gets raped, she gets executed for adultry.
In this case, the judge was upset 'cause she sassed him. Told him that he should go after her rapists rather than her. He hanged her himself.