Their's are much darker and look for all the world to be auto sexing as well, like a double barred bird...like Silver Cuckoos are.
Not gray, but black & yellow and one sex much lighter...they must have silver in them, don't you think ?
Course none of this helps her figure out what breed she has, all in all they probably are White Rocks, by shear popularity of the breed (Rocks)
As Illia has said many times, Almost all breeds developed in the USA (today) are bred off the backs of the Plymouth Rock...
That's because their picture is one white and one black. As to why they did that? No clue. I'd show a darker one but don't have any day olds in that color.
Not sure on the Everything being bred off a Rock thing, maybe commercial fowl and hatchery stock, but the Rock was such a late comer not that many breeds have it in their makeup.