It is not common to loose a puppy or puppies but unfortunately it happens, it can not be assumed to common. It seems like your case was the exception not a rule. Unfortunately so many things could have happened it sounds like no one will be able to give you an answer. If it was me i would have had an autopsy done as soon as the puppy passed. A fresh autopsy sometimes can give you some good answers. But this is how we all learn and get experience. If you decide to breed this girl again and forbid it happens again the autopsy will be a must and more research and health tests will be mandatory, also a review on the female's diet, vaccination protocol before mating , etc...
So sorry to hear that you are having such a hard time, do not blame yourself or anything like that, it sounds like you did all you could and again, that is how everyone can learn.
It did surprised me a lot to hear that the ER vets tried to get an IV on the new born puppy, i never heard of such thing for this breed as the tint size of the new born puppy would never allow for it , well, as far as it is my understanding. I can see that you did all you could in a responsible way and that should comfort you.
Blessings to you and remaining puppies.
XOXO
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