Hasta el viento tiene miedo (1968)
Hasta el viento tiene miedo (Even the Wind is Frightened) is a 1968 (1967 according to the ITESM) [http://cinemexicano.mty.itesm.mx/peliculas/hastaelviento.html] Mexican horror film, written and directed by Carlos Enrique Taboada. The film is about a ghost seeking revenge at an all-girls school. A remake was released in 2007, around Halloween, and it stars Martha Higareda as the protagonist.
More at Wikipedia.