The Bad Seed (1985)

Nine-year-old Rachel appears to be the epitome of perfection, but when provoked or confronted, her true nature surfaces. Following a series of unsettling events, Rachel's mother, Christine, begins to fear that her daughter harbors dark tendencies. As Christine uncovers the shocking truth that she is the offspring of a notorious murderer, her suspicions grow stronger, leading her to believe that innocent-looking Rachel might be a "bad seed"—a natural-born killer who lacks any sense of guilt or understanding of her actions.