Give it a little time. At 3 1/2 years old, moving to a new home is likely to be a difficult experience and it will take time for her to trust you, and to understand that this is a permanent change in her life. My boy Perry, who I adopted at 3 years old, bit me the day he arrived! And I had a couple of other incidents with him early on. I got the definite impression that he felt he was "just visiting", and it was the better part of a year before he seemed to be truly at home. Not that he went around biting people, but I was careful after that first incident that I did nothing that could feel threatening to him. He turned out to be a wonderful dog.
What is your dog's history? Has she been bounced around a lot, or just in one home up till now? If the latter, she may be quite confused at this turn of events.