I really agree with "Ranger's" advise !
And, Tinker Toy, I can so much see why you did not instill much training while Tinker was not feeling well. I would have done the same thing.
I feel Yorkies of any age are like a sponge and soak up "learning"...They thrive on it!! I would think that if you kept it positive for Tinker and turned a lot of her training into a game to keep her attention she will show you all that she can be!
I am so happy to hear that Tinker is doing great now, yeah yeah!!