I am torn. I feel for you as you are 'in love' with the 'idea' of her.
But I must say this...dogs are not just dogs, they each have their own personalities, their own needs and wants. Each 'family' also has their own personality, their own needs and wants. Not every dog is right for every family and vica versa. And honestly, I really can't imagine placing a grown dog with a family site unseen, how can it be determined that your family is right for her? And this goes for you too. You have never met this dog, so you have no idea if she is right for your family
I do hope that everything goes as it should...what's best for her and what's best for you...