Seeing a book in the library reminded me about this short story that I read many years ago. I do not know when it was published, but I can remember a lot of other details about it. It seems like it should be pretty obvious if anyone knows it because it is a unique story.
So in this story Joan of Arc is rescued by time travelers and replaced with a duplicate, then becomes some kind of time-traveling cyborg that gets sent to various time periods to fix problems, kind of like that old show Quantum Leap. It's told from her perspective in first person.
I hope someone can help me, it's been driving me crazy that I can't recall where I read this. Thanks!