Welcome to the Forum!!
Take a deep breath and relax
I think we don't know quite enough to judge the quality of the breeder completely even if it would really be nice to see her do all the testing.
Did you visit Buttons at the breeder's house? How did you find her? Any referrals? How many litters does she have at each time? Does she show her dogs and has references from other breeders? Does she charge an amount for her dogs that really should include more health testing?
I think there is a variety of quality in breeders and you have the whole range from top, top, top in every respect to the sleeziest backyard puppy mill that puts together any dog of breeding age no matter what health issues they have.
The puppies will be cute no matter where they come from. And you will fall in love with the sweet little furball no matter what. Getting a puppy from a breeder that does all the testing just increases your chances of not having to deal with medical issues and the heartbreak that comes with it later on. Health guarantees are nice, but realistically, could we actually return the "defective dog" for a new model after loving on them even for just a few months?
Then again, even breeders that DO all the health testing have puppies at times that are born with or develop serious health issues (but they will be right there with you if that should happen from what I have seen on this board...)
So all in all, there are no guarantees, but one way or other you should feel good about your decision and your puppy's health and getting one from a breeder that does do all the testing just really, really helps with that.
Can you go visit with Buttons and talk to the breeder again? Her reaction to your concerns would have a huge impact on how I'd feel on proceeding or not.
The availability of your breeder and staying connected would be another thing to think about while you still can. I envy the people on the board that have a close relationship with the breeders of their dogs. The ones that can board their furbabies with the breeder when they go on vacation and feel great about it. The people you can call when you are freaking out because this or that happened..... The kind of folks that WANT to stay in touch with you and the puppies they produced because they care, the ones where the relationship is not over as soon as the check is cashed.
So only you can make the decision, nobody else can do it for you...but my gut feeling is that you need to do a little more digging to come to a solution that feels right for you.