
Not a problem at all. Why not phone the breeder and tell her what you'll be calling the pup and she can make a start at renaming her? If you haven't decided yet, no matter. It'll only take her a couple of days to get used to the new 'noise', especially as she'll be getting all the individula attention, and the new 'noise' will only be associated with nice things - food, cuddles etc.
:)