It sounds like you are a wonderful yorkie mom. How lucky she is, but...there are a few things you might do to assure she grows up to be a strong healthy baby.
You should talk to your vet about putting your baby on very good liquid vitamins. Try leaving dry food out all the time, my little one will eat the hard stuff like its gormet dining between meals.
A lot of yorkies, especially small ones are run by eaters...You can also mix some soft puppy food with the chicken stick so she will eat it, even if fed by hand for a while
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Giving just protein is like putting your baby on the Adkins diet..it promotes burning of fat from muscle because there is no glucose or sugars for the body to burn. This sometimes causes weight loss and should be used a very short period of time.. All of us need a certain amount of fats, carbohydrates, etc. so we have healthy,shinny coats and lots of nutrients for strong, healthy bones development.
I use the chicken sticks as a treat or for training, and your baby will learn that the treat comes after a meal.
You are doing great, hang in there, but remember you are the mom and she is the pup...and mom's always know best!