What facts does Oona leave out of her discussion with Ochs about Berryman's murder in the novel, The Thomas Berryman Number?

AlthoughOona helps Ochs with the story, telling him what little she knows about Berryman, she leaves out the fact that she went to Nashville to join Berryman, that she was present when Berryman shot Horn, and that she was with Berryman when Cubbah stabbed him. It was Oona who hid Berryman's body in a field. Ochs does not learn this until after Cubbah is sentence to prison and gives him an interview. However, Ochs has sympathy for Oona and her family and does not hold her lies against her.