The Crystal Circle - D R Swan - Bog

Shannon Hunter is pulled from her body to a place that will, inevitably, have some frightful baring on her life. Since the modern world had ended a hundred and fifty years before, Shannon had continued to change. Now, she's found that she has become far more powerful than she had ever imagined.Something unknown is hunting, though, and Shannon can feel it. Something seeks that which will allow it to be, but what it is and where it's from is a mystery, and Shannon finds herself drawn to it like a moth to that fateful flame.