The Sicilian Inheritance by Jo Piazza

When Sara Marsala’s beloved great-aunt Rosie passes away, she leaves Sara a valuable piece of land in Sicily, but there's a catch: the locals refuse to acknowledge the rightful owner of the deed, and if Sara wants the land she must first uncover the truth about what happened to her great-great grandmother, Serafina Marsala. Because Rosie didn’t think Serafina died of illness as family lore states . . . Rosie believed Serafina was murdered, and she wants Sara to prove it.
Sara's investigations take her up and down the picturesque Italian countryside and, along the way, she learns more about Serafina, a headstrong young woman thrust into motherhood in her teens, who fought for a better life for all the woman of her small village. Yet a woman who challenges the status quo is never safe, and as Sara discovers more about Serafina, she comes up against the same menacing forces that took down her great-great grandmother.
And now they want to destroy Sara too.