OH NO ! I'm SO SO SORRY ! That poor poor baby and how heartbroken you must be...
Did anyone test her for Coccidia ? that will cause the symptoms you described....and it's NOT true that all small dogs have popping knees ..this breeder totally mislead you and that is LP an ailment of yorkies.... but by no means do they all have this problem.
Having double teeth is common and usually if the baby teeth do not fall out on their own - they have to be pulled so this really isn't the breeders fault....her adult teeth were coming in that's all...
I know finding out could help you for the future if you decide to get another yorkie and I surely hope this breeder will offer you another one ....even though you are still hurting from her death.
I think the vets may have a play in her death also if they didn't test her for parasites.
This is truly a sad thing for you and your puppy to go thru.....
May I ask the breeder since I'm in Houston ? I may be looking in the future and would like to avoid this one at all costs.
I would also report her to the BBB and the AKC....No breeder should be telling people what that breeder told you.
and again...I'm very sorry for your loss....rest in Peace little Zoe....