Caitlin Esquibel was Solomon Epstein's wife. She had a liberal arts education.
A month after arriving from Luna, she met Epstein through mutual friends while working with resource management for Kwikowski Mutual Interest Group in the research centre at Dhanbad Nova on Mars, and after seven months they had developed a relationship. They married soon after, and were married for seven years before Solomon died testing his prototype Epstein drive.
Caitlin presumably sold the plans for the Epstein drive, becoming a rich woman and enabling humans to travel to the outer planets.