This is a video of Winter that I took on August 18, 2014 at Clearwater Marine Aquarium. My suggestion is to keep the volume down as it is distracting. 

The video capsulizes the behavior of Winter over a period of two hours. She rarely changed position except to go by the door to the divided tank where she hangs out a lot.

 It looked to me like Hope was trying to encourage her to swim the small parimeter but to no avail. It is one of the saddest times I have watched her. At the end of the first dolphin movie the caption was that Winter was a healthy, happy dolphin. Does this look like a happy dolphin?