[rrosenberry]

Welcome to the world of having a Yorkie pup, I swear when Bailey was under 6 months old, he would think his name was " NO" or Bad Boy, or NO BITING! It was crazy.. I remember asking people " When does this stop?"
But.. just keep doing what your doing, Everytime.. NO! and especially when she goes at your face, Praise her and treats when she's good,and let her know when she's done something bad,, a loud NO, worked well with mine, they know,, he would look at me before he did bad things to see if he was gonna get away with it.

And they do have puppy classes that might help, I took Bailey at about a year old and wish I would have started sooner.
Good luck.