If she was floating in the water with her lifejacket on they’re going to have to say she died of a heart attack. And the stories about them thinking everybody was fine makes no sense with the story of the deputy director, because he said she let go and there was no response from her so he knew from before any rescuers arrived that she was not OK.
Oh sorry. I had missed that detail. If that’s the case that she became unresponsive in full view of others at the surface of the water then everything I was wondering about is of course completely moot and a waste of words. Apologies.