Unfortunately, without a copy of the contract, you don't know if there were any stipulations (or fine print). As per PM, talk with your cardiologist who can possibly help you further....if congenital cardiomyopathy is determined by the cardiologist, then the breeder should, by all means, act responsibly and review past and current records on her kittens, as well as work toward eradicating this 'defect' from her breeding. (I'm not a breeder, so I would be hard pressed to say how that's going to go...also, remember there is a difference between congenital and aquired, your cardiologist is the only one who can make that determination. If it turns out to be aquired, the breeder would probably not be accountable, although cardiomyopathies are rare in young cats)
Yes, ask about the anesthesia used (injectable vs ISO, or what combination injectable was used - typically, males are neutered with a combo injectable anesthetic, while females are spayed with either a combo/ISO or ISO alone, but every vet chooses what he/she is most comfortable with per procedure). Also ask about details about your kitten's "crash", the length of time CPR was administered, and ask for details, don't settle for a brief comment. I would also request a photo-copied record of that day's events recorded in kitten's health chart.
Depending on what you are told when you pick your kitten up from the clinic, will depend on how you wish to proceed. If you are not satisfied with the answers to your questions, or if you have a gut-instinct something is not being revealed to you, and they refuse to give you a copy of her record, then I would suggest getting a second opinion from another vet, and having that vet review those records. But, at this point, since your primary vet is suspecting a cardiomyopathy concern, your first concern should be to get an appointment set up with the cardiologist and worry about your primary vet later. (do try to get a copy of kitten's records first, regardless of the conversation you have with your vet)
Keep in mind I'm not trying to persuade you to take action (legal) with your primary vet at this point, because he has yet to converse with you about the incident in detail...you and he should be the only ones privy to that conversation should a legal issue arise later on. This also applies to any monetary damages you try to recover. Depending on that conversation with you will depend on your approach to ask about reducing the fees. If your vet truly feels it was an isolated incident, he will have no true obligation to reduce the fees for an emergency resuscitation, but this is where a copy of kitten's medical chart will be in your favor (so you can review for yourself the comments and notes recorded during and after the incident)...........................Traci