what does "nautical doll"here mean?
I left them in a moment, amused as I saw Ailie visibly making up her mind that here, anyhow, was not the ideal. But Lieutenant Earl Schoen was not to be dismissed so lightly. He ran his eyes cheerfully and inoffensively over her cute, slight figure, and decided that she would do even better than the other. Then minutes later I saw them in the water together, Ailie swimming away with a grim little stroke she had, and Schoen wallowing riotously around her and ahead of her, sometimes pausing and staring at her, fascinated, as a boy might look at a nautical doll.