A Killer Among Friends (1992)

Beautiful and popular Jenny Monroe has everything: the looks, the popularity, and the perfect mom. One day, Jenny goes out with her friends to the park and doesn't come home. Three days later, Jenny is found murdered face-down in a lake. Her grieving mother Jean, who had a special bond with her daughter, won't rest until she finds out who her daughter's killer is, and neither will Jenny's best friend, Ellen Holloway.