Dead Mary (2006)

Synopsis
An unassuming group of vacationing high school students incurs the wrath of a relentless supernatural killer in this tale of terror from beyond the mirror starring Dominique Swain. They had no idea that such an innocent rhyme could conjure up so much death, but as the woman with an insatiable appetite for death methodically begins claiming their lives on by bloody one. ~ Jason Buchanan, All Movie Guide