How is Bella's body located in the novel, The Widow?

At the very end of the novel, it is revealed that the body of Bella was left here by Glen. Glen brought Jean here after she demanded they go and see Bella. Before they left, Jean set the GPS in the car so she would remember the location. Glen died a few days later, and after his funeral, Jean snuck back here to be with Bella. The detectives follow her and are finally able to locate Bella's body as the novel comes to a close.