It's been said, through the Twilight series, that Rosalie has always wanted a child. She is even Renesmee's God-Mother, but that wasn't enough for her, it didn't satisfy her need for her baby girl. After years of begging and pleading Emmett and her family, her wish was able to become a reality because of the rest of the Cullen's. On their wedding anniversary Rosalie, Emmett, Carlisle and Esme fly down to Camden, Georgia to adopt the baby girl they had both wanted.