As much as you've spent at the vet, you'd THINK that they would be more lenient with the bills.  Please just talk to them about all this.  If she's continuing to be sick, obviously they haven't fixed the problem.  If you took your car to a mechanic (bad analogy, I know

 !), and still had the same problem, they would NOT keep charging you over and over again.  Sure, you might have to pay for parts (or medicines), but you shouldn't have to keep paying for office visits, or they should be substantially reduced for you.   
I'm so sorry that you are going through this, and that little Zoie is still ill

  I'd definitely take it up with her breeder, website exchanged be damned, she sold you a sick dog!  She has her website up and running thanks to you, and you should have a healthy puppy!  
 
 
Just my 
