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If you did not sign a waiver or contract that states you purchase the dogs as is so to speak, you should draft a demand letter to the breeder demanding a refund of your money by a specific date enclosing all the vet bills and supporting documents and inform them that if they fail to pay you for the dogs and vet bills, you will seek relief from the court by filing a complaint.
File a small claims court complaint against them if they don't comply with your letter.
I have not seen your documents, contracts or other evidence.
There is not copyright infringement which is as follows:
Copyright infringement (or copyright violation) is the unauthorized use of material that is covered by copyright law, in a manner that violates one of the original copyright owner's exclusive rights, such as the right to reproduce or perform the copyrighted work, or to make derivative works.
You could sue her for fraudulent misrepresentation and fraud that warrants punitive damages to punish her and prevent her from doing this to others.