The Puppets of Low Magic

Rachel Mapes is a Puritan woman who, upon accident of birth, receives an IQ of 160. She has a level of understanding that would take others years of book-learning to achieve. She is able to make connections where it would seem no connection was possible. She possesses strong powers of intuition. And she has to hide her special abilities…or be burned at the stake.
What if she really is a witch?