I see Rosalie as Renesmee's loving, doting aunt. :) That little girl is most likely her world, along with Emmett.
I could see Rosalie as her protector, one of her four main role মডেল সমাহার (along with Alice, Bella, and Esme), and perhaps almost a সেকেন্ড mother. I mean, Renesmee is probably like the child Rosalie always wanted. She may not be her own child, but her presence alone is most likely enough to make Rosalie thrilled. :)