She's gorgeous.
Your description of your first seeing her is almost identical on how we first encountered our Echo.
Shivering and hiding.
We went in and simply sat on the floor.
It took a week for her to come out and walk by us.
then the next week she lay down next to us and let us pet her.
By the 5th week we took her out for a walk.
The week after that we introduced her to Bear (our first White GSD . . .RIP big boy) and took them for a walk together.
the week after that we took her home.
She has bonded with my entire family, but doesn't tolerate strangers.
Even when we're out on a walk, if someone simply nods and says, "Morning" she will bark at them.