[Amazing Yorkies]

Welcome to YorkieTalk and welcome to the world of independent Yorkies!
I find that chasing a Yorkie is a game to them. I get where they can see me then without looking at them in the eye.. I get a silly higher pitched voice and act like I'm giving attention to someone else. They can't stand not getting the attention and run to me.
I use boiled chicken for only important times of training. It works good when they are scared in the show ring. But in your case, I would sit on the floor and hold the chicken out and set one piece near her for a taste, then I would hold one piece out for her to come and eat it out of my hand as I am calling or talking to her for trust.
I use a special word when when I give my treats so that word becomes important to them.
There are many professional trainers on here, hopefully they will give you better advice. Again, welcome to YorkieTalk!