Welcome!!!! Congrats on your new baby!
I would say that yes she is big for a yorkie of that age. She will probably be a bigger Yorkie, but I am sure she is a Yorkie if you have AKC papers on her. As far as her parents size.... you don't know if her grandparents were teapots.
I have 2 puppies from the same litter and keep up with most of the litter mates. The parents were 4 1/2 and 10 lbs. One puppy is 4.2 lbs (the runt) and another puppy is about 6 lbs. My 2 pups are 6 1/2 and 7 lbs. The biggest and first born puppy though, he weighs 14 lbs! They are all from the same litter and yet he is twice what any of the others are. It is possible for the smaller parents to give off a large offspring because it could come from a grandparent.
Your puppy is adorable! Love the puppy and you won't care how big it gets. Don't listen if you take it places to people telling you it is a silky. They try to tell me that my AKC registered 7 lb Yorkie is a silky when I go to petsmart! He is actually a fairly decent representation of the Yorkie Standard. Not perfect, but not bad either and Petsmart still tries to tell me I have a Silky because he doesn't have hair on his ear apparently to be a true Yorkie. LOL
__________________  It's raining Yorkies here! LOL Teek  ,Rowan  , Raksha (Grand Puppy)  , Raelyn |