After a public train, she was probably thinking, “Boats? I don’t need no stinkin’ boats….” And good on her. OR…she was carrying drugs and didn’t want to risk a 2nd close encounter.
Yeah I shouldn’t have cast such a cynical suspicion on why she refused the boat ride back, maybe she was just a great athlete and who was, as another poster said, proudly self sufficient. But why not accept the boat ride and have them arrange for you a ride home? Wouldn’t any cell phone she had been ruined from the swim leaving her without communication? Altogether her actions seemed a bit over the top and dramatic to the situation unless she had something to hide.