Aww hun! I'm so so so sorry about ur little angel!
I usually give my puppy the "little bits", BUT if it's an allergy even that wouldn't be any better! I know some people that can't even have Wheat Gluten.
I hope so much that she'll be ok soon! It's so hard when something's wrong with a new puppy! Mine had bloody stool for a long time
She's much better now but my husband and I were about to go crazy! So we somewhat know what you feel like, but not to the extent of the IV etc
I hope you find out what the problem was and that it's all puppy kisses and fun from now on!