They Loved the Fake Sister, Lost the Real One

Violet, the blood wolf sister of three Alpha brothers, is diagnosed with terminal bone degeneration. Yet her brothers drag her to a carnival for her 18th birthday, forcing her on brutal thrill rides and ignoring her agony until she dies alone. As a ghost, she witnesses her brothers favor adopted sister Chloe, even erase her from the pack. Later, hidden evidence reveals Chloe poisoned Violet, sabotaged rides to kill her, and murdered their parents out of a revenge scheme.