Helen's Sacrifice (1914)

In the first entry in the popular Hazards of Helen series, Helen, the night telegraph operator at Lone Point, relieves Benton, the day operator, several hours ahead of time, because he is caring for his sick child. Receiving an order to sidetrack a freight until the fast mail passes, Helen mounts a horse, takes a short cut, leaps from a fifty foot cliff into a river

Unfortunately the movie Helen's Sacrifice is not yet available on HBO Max.