Well, unfortunately,I think that you might not have an avenue here as 1) the dog wasn't spayed, which most likely will void the contract, and 2) you, personally, do not have a contract with the breeder...the original owner does. These contracts are usually not transferable to a third party, unless mentioned in the contract.
I don't know alot about contract law, but I think the contract might not be worth the paper it's written on right now, and because of that, the breeder (legally) does not have to do a thing to honor it. She probably feels betrayed a bit by the original owner, and a bit upset being she wasn't contacted by the original owner when she decided to give up the dog.
I'd definitely check with a lawyer, to see what your options are.
I'm so sorry to hear about your little one...I hope that she can get well and that things work out for you.
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