WOW!! Well as with any rescue you have no idea why they do what they do!! My Daphne is a rescue. I've had her for 5 months and she just walked into the kitchen by herself two days ago! She has a thing about thresholds and hesitates when she goes through any doorway by herself! OH, OH, and she woofed, low, when she heard the mail man put mail in the slot!! That's HUGE, she's finally "protecting" her home, reluctantly but it's a start!! Give her time, she's probably still very unsure and if she's been moved around that much she's just waiting for you to get rid of her too. She'll come around, it will just take time.