I'm so sorry that this is happening.
It would be a good idea to at least let the breeder know that she's selling yorkies with serious problems even if she's not going to help you out with the costs.
Check out the pet lemon laws in your state and see if there's anything that can be done that way.
Also, I believe that luxating patellas can be corrected with surgery, and with the MD, there are medicines that your baby can take that will keep her liver functioning right.
Please keep us posted on any updates and let us know what your breeder tells you... Good luck!