I think your baby is all (adorable) Yorkie. I just wonder why you would question her AKC papers? If you look at a concentrated group of Silky pictures, you can easily see how different they look than Yorkies. Yorkies can and do have longer snouts depending on their lines, but the Silky snout is more wedge shaped or masculine looking in comparison.
silky terrier pictures - Google Search
I love both Silkies and Yorkies. Ever since my daughter brought home our Moka I didn't know much about either breed, but I now believe her to be a Silky Yorkie mix.