USDA certification....from what I understand, that means she's a licensed commercial breeder. She's a person producing a product for a profit. And that is definately not what you're looking for.
Here's how you find a good breeder. Basically, a good breeder is someone who only has the breed's best interest at heart; they want to make their favorite breed better.
1. They only breed dogs that have done well in the show ring. A good breeder wants only the best puppies, so will do everything possible to determine that the parents are exemplary specimans of the breed.
2. The parents are at least two years old, and have health certifications. By that, I don't mean that they were checked over by a vet. It means that each dog was carefully examined through specialized tests, and determined to be free of genetic problems that are common to the breed. For example, my mother's maltese has certified patellas and eyes, and many large breed dogs have their hips certified to be free of dysplasia. By going these extra steps, a good breeder ensures that any puppies will be as healthy as possible.
3. A good breeder will NOT have many litters, and never two at the same time. There will be a waiting list for puppies, since they do not produce that many litters. They want the pups to have individualized attention.
4. When you contact a breeder, they will interview you much more than you interview them. They want to be sure their puppies will go to a good home.
5. They take responsibility for their puppies for the life of the dog. Good breeders have a contract that says you cannot rehome your dog; if you can't keep your dog, you must give it back to the breeder. It doesn't matter if the dog is 10 weeks old or 10 years old. They want to know that all their puppies are taken care of.
Take a look through the breeding section of the forum. There's a lot of good information there.