A Break with Charity by Ann Rinaldi

a group of girls meet at the parsonage with Tituba, the minister's Caribbean maid. The girls begin to accuse people in the community of being witches. Susanna, the main character, knows the girls are lying, but is afraid to tell anyone for fear her family will be accused of being witches. It is also based on historical accounts of the Salem witch trials and the idea that the accusations were made because people were mad at their neighbors or wanted attention.