Wow, that's very interesting/troubling. Has there been any confirmation of this from another source?
With the hospital only an hour away, getting a medical helicopter, flying, landing can sometimes take as long or longer then an ambulance. This can be especially true if the ambulance is sitting right there, ready to go.
Another possible reason could be in consideration of a low platlet count (easy bleeding). Helicopters can be deferred if the patient is bleeding very easily in fear of a "hard landing". Oddly enough I was talking to someone just yesterday morning who had to be taken once via ambulance for this very reason.
Just some possible considerations.