Yorkies are Ratters ... so they instinctively go for quick small moving objects
and hands fit that bill
Don't be surprised if you tap into that behavior that your dog
esp a puppy isn't going to bite down hard
Be lucky she hasn't tried the death shake on you yet
With that all you need to do is make a Loud noise or a NO BITE!
and get up and leave
Do Not continue to play with her if she gets rough
and she'll soon see that playing nicely gets the attention