Arya has had her heart set on killing a queen since Cersei stood by and watched her father be beheaded. In "The Bells," she turns away from her vengeance quest only to find herself stumbling through a devastating war scene caused by a different queen entirely. She survives the Battle of King's Landing and takes off on a white horse, seemingly with every intention of shutting Daenerys's green eyes forever. She's a girl on a mission, but despite her desire to kill the Mother of Dragons before she can take out Sansa or someone else that Arya loves, this may not be her kill to make.