Dama de fuego (1977)

Jenny Grey a horse loving country girl leaves her widowed father to move to the city after her father's frustrations towards Jenny and her desires to ride horses, after her mother had died from a horse-riding accident. Jenny finds work at a country race track and becomes obsessed with a troublesome horse called "Blue Fire Lady". "Blue Fire Lady" shows promise in Jenny's hands, but around everyone else misbehaves and shows no discipline. When "Blue Fire Lady" is put up for auction it is up to Jenny to either buy her or prove her.