Personally, I wouldn't touch this breeder with a ten foot pole. Dogs sound really nervy (could be just the environment), but I still wouldn't like it.
There are great sections here on how to find a breeder. The lady sounds nice, but not someone I would get a dog from, especially with children in the house. You need a dog with solid, strong, nerve. Not a "shy" dog.... Shy dogs can lead to fear aggression and fear biting, just be careful. They don't always lead to that, but why take the chance.
"An excess of size is an unserviceable feature for breeding, his powers of endurance, his speed and the smartness of his movements suffer in all circumstances. Giants are never nimble."-Creator of GSD