Selah- only child of the Dark Lord, Sauron- had been on the mission to claim Erebor with the rest of the dwarven company (and one hobbit). In fact, she had been the main reason the mission was a success. Bilbo, in an effort to protect her and keep her location a secret from the Dark Lord, had deliberately left her out of the stories. Saleh, however, wants her story to be heard.