So, she got a great show dog but a breeder whose demands did not match her needs. Suffice it to say it was not a pleasant situation. Don't let your common sense be overwhelmed by puppiness. Ask about the health of the sire and dam and their lineage, in addition to the health of other litters. I'm not sure I'd want to be the buyer whose pup is a breeder's first health problem.
Contracts are too easily broken and it's expensive and time-consuming to fight a breeder.
Tell me what you've done in the past, not what you SAY you'll do in the future. I gave the owners the choice of keeping the sickly pups or returning them to me to live out what they could of their lives here. Find out if the breeder cares enough about you to do what they can. But have reasonable expectations. Stuff happens and breeders aren't gods.