She killed Valentine's maternal grandparents: Marquis and Marquise de Saint Meran, Noirtier's servant: Barrois accidentally. She also tried to kill Noirtier, but he was immune to the poison, and also Valentine, but she was induced into a coma to fake death by the Count. She also killed her son before commiting suicide herself.
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Heloise Villefort killed three people in "The Count of Monte Cristo": the Marquis de Saint-Meran, Barrois the servant, and Valentine de Villefort. She used poisoned drinks to carry out the murders.