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I could be wrong and if so hope other members will jump in, but she looks like a beautiful Silver to me. The color of her very young face is the giveaway: it's a very
light silver while the rest of her appears black.
You'll see that pattern if you do a
google image search for Silver poodles and click on the various photos.
This article on Poodle Silver coat colors should clarify.
This page on Blues is informative too.
If you haven't sent in the registration yet and you're still not convinced, you can send her photo to AKC, see
this page. If you go with your breeder's assessment and she turns out to be a blue 2 or 3 years from now (this happens frequently with pups born jet black), for a small fee you can change the color on her registration. For the form call AKC at (919) 233-9767.