Yes, please get a letter from your vet that states the puppy is unhealthy and document her exact symptoms.
Call your credit card company and tell them your bought a dog and it arrived unhealthy and is in the vet hospital. You will need to get that money back to pay for her vet bills.
I would NOT call the "breeder." She is a puppy miller and she's not going to do anything for you. Just settle it directly with the credit card company.
Unfortunately, this is not an uncommon situation with puppy mill dogs, especially tiny toy breeds. :(
I really hope she will be okay.... please keep us posted.
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