I would not buy the puppy. It doesn't feel ethical to me. In my book, it's sort of rewarding her for being a neglectful piece of ****.

She buys a puppy. She doesn't give a rat's arse about it. And she gets compensated for it and can relinquish it with impunity? Nope! No way would I pay her.

And in the case the situation gets dangerous: Call AC.