My wife says she saw her get out of the water in a normal fashion, and she doesn't think she's exhausted, but just stretching and enjoying the sand and sun. By the way, my wife also pointed her out to me, remarking about the blue flippers. :-)
Thanks, Peter. Good questions, but I don't have all the answers. I watched the scene for less than a minute before taking this shot. She'd been sitting in the same spot with a male companion (you see his shadow at the top). The waves frequently came all the way up to them, washing away any footprints between them and the water.