Your dog is adorable. You know, you just never know I have found out, what they're going to turn out looking like. My 14 lb yorkie, came from 4 lb parents. Her parents both had beautiful hair, mine has nice colors, but, her hair never grew right, and she has terrible allergies.
She is 6 years old and is still pretty dark, except for her face.
Now, I had another yorkie girl(my son has her now) and she is going on 2 and a beautiful silver almost white colored. I think I should have maybe gone ahead and bred her, she was 5 lbs and in my book, she was perfect. Look at her background, she may just be bigger like mine, yet produce small yorkies. Good luck on whatever you decide to do