From what I read, they had pulled her out (she was the only one semi-trapped) and she was distressed but had been floating and talking and everybody thought she was fine. Then she sank and I’m not even sure the other people realized this. It may have happened around the time the CG arrived. I don’t know because the reports were sort of sketchy and that’s all my information comes from.
Personally, I would have been pretty stressed because of the sharks...