Those are precious pictures! I especially love the one with your dad. Dogs have a way ...
As far as the stains in her coat, waiting to give a bath is a good idea. The white shampoos should work. Obviously my guys are white too, and although the coat resists dirt, nothing resists Virginia clay. I will pm you with what I use. I use a combination of dog mane and tail, and the " Blue" which is a conditioner and takes out resins etc in the coat. I mix half and half.