She is adorable!! She looks all yorkie to me. She actually looks like a red legged yorkie to me which would explain her hair. Red legged yorkies hair is a lot more sparse and doesn't grow as long or as thick as a regular yorkie.
You can do a search on here for red legged yorkies to see how they look to compare.
Here are a couple of threads about red legged yorkies....
http://www.yorkietalk.com/forums/gen...ed-yorkie.html http://www.yorkietalk.com/forums/gen...e-siu-pao.html