She's lovely I can see why you fell for her. Basically my only advise is give her time. We rehome quiet a few ex-working sheps and it's all just a matter of leaving them to figure it out for themselves, they need to learn the new place they are is safe and unpressured and pretty much the rest will fall into place when it happens. She's enjoying her walks and that's a huge plus because many freak out completely when faced with a simple walk down the road!! Hard to do but you just have to be there and not force anything and it will all come good. Sounds like the previous accidents of her biting were by people being in her face and expecting too much, you having a much more relaxed and quiet manner and she'll soon be chilled out and happy. Well done for taking her and giving her a chance.