Poor dog and how good of you to give her a good home.
Three years ago I adopted a street dog from Sicily where they are treated like vermin. He is a lovely dog, but he still has issues which stem from his puppyhood on the streets.
He is afraid of everything and taking him out is extremely difficult because he is so strong and wants to go after every animal, human or vehicle he sees! He’s not vicious, just frightened.
At home he is obviously secure and you couldn’t wish for a sweeter natured dog, but I have to be careful not to startle him. Even picking up the broom, or mop has him cowering in a corner. I think he must have taken a beating in his past which he can’t forget, poor chap.
I’ve tried many different trainers who have helped a little, but haven’t addressed all the issues.
I wish you all the best with your rescue. She’s lucky to have found a good forever home.