Sweet Aralia

Harry is killed in the Triwizard Tournament! From 100 yrs before her birth, a dying man writes his last letter with an idea that becomes the New Order's plan that could defeat the Dark Lord. But it requires a one way trip back in time with a warning to watch out for Sirius Black and his father. Can she gain the trust of Sirius and Remus, but most of all, trust Severus Snape!