Gloria resides on the island of Guarma.
Events of Red Dead Redemption 2
While on Guarma, Dutch van der Linde and Arthur Morgan hire Gloria to guide them through a cave system to Aguasdulces, with Dutch giving her their last gold bar as payment. Once they reach the exit, Gloria demands more money and when Dutch refuses, Gloria pulls a knife on him. Dutch, however, disarms her and proceeds to strangle her to death, prompting dismay from Arthur. Her death is arguably one of the turning points in the relationship between Dutch and Arthur, with Arthur becoming far more skeptical of Dutch's plans, as well as his mental state.
Gloria is an old, toothless, half-blind woman with a dark complexion.