Sounds like a really good one you have. far and few apart. If you do decide to do some bite work with her, only give her a couple of bites to see what her jaw is like. Some people ruin there dogs by giving them bite work all the time. We used to do it for years. We would give the dog a couple of bites on the slieve and leave it at that for a few weeks. Once we had a good idea of the dogs bite we would leave it at that. Try and get her to squeeze instead of pulling and shakeing the slieve. If you do too much bite work your dog can go of its head, they lock onto the slieve and go into a trance.