I've Been Waiting for You (1998)

When a California teen with an interest in the occult moves to a New England town, she finds that the town teens believe she is a witch sent to seek revenge on the descendants of the people who originally killed another witch 100 years ago. Things take a particularly deadly turn when they convince her to play a seer at a Halloween party where they will feed her information over an earphone about those who enter her tent, but she suddenly sees things beyond their knowledge or help.