The Light of Western Stars. Zane Grey

Madeline Hammond is wealthy woman from a patrician New York area family, known as Majesty who decides to travel out West where her brother is working as a cowhand on a ranch in New Mexico. Her brother is in conflict with the local corrupt sheriff, so Majesty has to bail him out with the help of Gene Stewart, mean and rough cowboy who takes interest in her. The newcomer lady establishes a ranch, but her troubles don't stop there as there is a revolution going on down south and the rebel issues begin to affect her businesses.