Welcome to YorkieTalk. That little girl is so lucky to have you in her life.
There is one suggestion I have, since she gets stressed when she hears 'No'. When she does something wrong, don't scold. But when she does something RIGHT, praise her profusely. And reward her with a treat. This will help build her self-esteem, and teach her what you expect of her.
This method has always worked well for me in training my puppies. Good Luck and keep us posted!