Abducted by aliens to train their horses.

Sci-fi original plot! A mountain girl discovers area horses disappearing. She goes to investigate and ends up abducted, and taken to their home planet. She is locked into their stable and corral. She finds a few of the horses she already knew about. They are comforted by her presence. She has to learn to communicate with the aliens to care for the horses. In time she is basically in charge of giving the aliens pony rides. She is part of a daily festival, and one of the attractions.

Your character is her supervisor.