Death Cheater: The Boxed Set. The Death Cheater Series

Book One: Athena Gray knows she's strange. Dead butterflies flutter to life with just a wish, and she saved her dying grandfather by willing him to live. The only person who doesn't think she's weird is Dan, the most popular boy on Omega High School's baseball team. But who can have friends-or more-when a dark spirit shows up and stalks your every move? Dan can't understand the reason Athena acts haunted, until the paranormal visitor turns to blackmail, forcing her to come clean about her gift.
Manipulated into using her power for terrible things, Athena must stand up to the darkest force she's ever encountered, before those she cares about get hurt. Book Two: Athena Gray hopes her senior year of high school will be a breeze, but a dark force comes to town determined to ruin everything. Anxious to protect her family and friends from paranormal danger, Athena ignores strange events at school until they follow her home.
It isn't until the mysterious new arrival causes a near-fatal accident, that Athena realizes she must contend with an angry and jealous ghost who wants her dead. Too late, she learns that somewhere between this life and another, someone thinks she cheated and that it's time for revenge.