History made a mistake

Nancy Hale has been buried in the ground for 309 years. One day she wakes up as if she had just been sleeping for a day. This girl~born in 1708~ wakes up in 2017. Nancy knows absolutely nothing about today's current technology and "word choices." She's completely and utterly lost and confused. She swears she's not crazy, but begins doubting herself after a while. Anthony Bell is the only boy she could find that was "willing" to help her. He, of course, thinks she's absolutely mental, but eventually feels she might actually be telling the truth. But how is that possible? She died in 1725, but walks the earth again after being dead for 300 years. Not a scratch on her body. Not a bruise. Nothing.
But.
There's a scar under her left eye and she can't seem to remember what it was from. It's in the formation of an "X" yet she recalls no memory from it.
Anthony helps her become a "normal teenager." Will she ever actually find out why she's suddenly awoken from the dead? Or will she be forever stuck in the 21st century?