I asked her about how to tell what color they would be and this is what she said in a reply:
"All black, blue, and silver puppies are born black. When born, Blacks do not have white hairs in the pads of their feet, whereas blues and silvers do have white hairs in the pads of the feet. Blue puppies have blue skin and take 3 to 4 years to clear out to their steely blue color. Silver puppies are obvious the first time you shave the face and the face is a much lighter shade. Silvers usually are completely cleared out at 2 years old. Also, blues and silvers have brown hairs early on to let you know they won't be black.
Here's an example using Hot Rod who will be blue. Most likely he will be a lighter blue as an adult. He has blue skin."