I am so sorry this happened to such a precious little puppy. My heart is breaking knowing that two of these tiny babies met such a fate when it did not have to be. Another month with the mother, gettting more weight on her could have meant all the difference. This breeder needs to do some serious self-evaluation!! What are you doing to these puppies and the people who trust you to know what you are doing.
Breeding dogs, especially yorkies is a serious responsibility not to be taken lightly!