She is a supporting character in Shadow of the Tomb Raider.
Abby is descended from the Inca's who live in the area. She lived in Kuwaq Yaku for her entire life except for a brief period where she moved to Lima in order to get her pilot's license.
Lara Croft and Jonah Maiava came to Kuwaq Yaku in search of Mayan ruins, she laughed, telling them she wouldn't find any as the Mayan's weren't from Peru, though she pointed Lara in the right direction. She quickly hit it off with Jonah, leading to the pair forming a romance.