Fallen Angel (1981)

Twelve-year-old Jennifer is unhappy with her widowed mom's relationship with a family friend. Feeling lonely, she readily accepts the friendship of an adult man named Howie and joins the softball team he coaches. Howie is soon convincing Jennifer to pose for photographs which become more and more revealing. He turns out to be a pedophile who works in child pornography and plans to make Jennifer a "star". Will her mother be able to help her before it's too late?