You're making a big assumption that she was rejecting you...it could have been that she is new at swinging and suddenly got spooked.
It happened to Mrs. Belkin the first time out, and we've seen it happen to at least one other female. In both cases, play time was going just fine and then all of the sudden, it was over...gather up the clothes and head for the door!
When Mrs. did it, I waited til later to ask what happened and she filled me in...things had just progressed too fast. She had thought she was ready, but when it got to the thick of it, she realized she needed more time.
That's how I recognized it when it happened to the other female. The look on her face was so similar to what Mrs. had done...
Relax, my dear ape, it could have been any of a number of things. And if was you after all, hey it's her loss. Things can't go perfect every time. Unfortunately.