Mega bad english sorry
She is an angel who was degraded to being inferior by practicing forbidden witchcraft.
She did it by bringing back to life the being that she loved being something impossible (he died in a fight against evil, in a war), that's why she hated her god when he was never to blame for what happened, simply To make her chastise for her behavior by using her power unduly, punished her with a lower form until she reconsidered.