Sharon Brown and the Prophecy

On her twelfth birthday, Sharon Brown, a competitive and temperamental girl, just found out that she's the last in a long line of 'Protectors' dating back to almost a thousand years. What does that mean? It means that she's an extremely powerful witch who's purpose is defending the supernatural world from from Lord Drojen, an extremely powerful dark wizard who's sole purpose is to enslave the supernatural world. Drojen has been the opposing force of the Protectors for as long as they've been around but now, as Sharon is the last one to ever be born, it's her job to make sure he's defeated for good.
(not really good at summaries sorry)