Yes.u mean that if i brought egg back without saving her she is lost forever?
But as said, if you lose her you can interact with the ghost in the goblin valley to get a second chance with her. Similar to the ghost in the vampires crypt that resets the vampires storyline if you just killed them during "Cemetery Rumors," or the ghost where you killed Master that resets Oksana if she dies or you told her the truth.