Hello, Sarai,
The picture you're describing is exactly the one I remember seeing. She was standing on a rock, wearing a white dress and was barefoot. I seem to remember that she was facing the to the right of the picture, but looking at the camera and smiling. I believe her hair was down, which would fit if she were only 14 or so. The other photos of Anya V and Alexandra also fit, as I believe the photo was taken on the same trip as the one of Olga standing to the right of the reclining Alexandra and Anya. I just wish I could remember the name of the book. I remember that it wasn't a book of photos, but mostly text. I think it might even have had the double eagle on the dust sleeve, but I'm not sure about that. Anyway, at least I know now that this photo actually DOES exist, so I'm one step closer. Thanks.
Ilya