After the Volturi had left Rosalie hurried back to the house, as Alice had seen a vision where Rose would be given a gift. When she arrived a baby girl was on the door step, with a note placed on top of her basket. Rose and Emmet couldn't be happier their dreams of being parents had come true along with having a niece as well.
They named the child Zoey Mae-Bella, as she grew older her and Renesmee were taught how to cook, clean, control their powers, manners and many other things. Rose and Emmet loved it, Zoey gave Renesmee a nickname which was her middle name Carlie while Renesmee called Zoey Mae after her middle name as well.
The Cullen's decided to keep Zoey a secret from the Volturi knowing Aro would want Zoey for her power.