This is the fog of accidents. The internal injury report appears to come for the Coast Guard officer in the plane flying over the accident on the day of the crash. The preliminary cause of death comes from the fact she was fished out of the ocean and there was no trauma to her body. The arrhythmia comes after the autopsy could find no obvious cause of death.
It reminds me of the Sago mine disaster where thirteen miners were reported to have been rescued alive but that was changed to one was alive and twelve were dead. Miscommunications are not that hard to imagine in these types of situations.
Or the recent Asiana airline crash in San Francisco. Paramedics using the START triage protocol said a victim was dead before she was run over by a fire truck. The coroner ruled she was alive at the time. All trained professionals but they came up with different answers.
I would find it much more suspicious if all stories matched up exactly.
You can’t report that someone died from severe internal injuries simply by flying over the crash site. The preliminary cause of death was made after the autopsy by the medical examiner which was changed later to cardiac arrhythmia. Of course there was confusion at first as to how many people were in the water, how many had been rescued etc. But not when it came to assigning cause of death.