To abduct someone at that speed would mean a vehicle being involved, which would mean tyre tracks (those fields are muddy). Nobody has said anything about a vehicle, which would have been on a lookout list almost immediately.
Agreed. If she was taken, the speed would have required a vehicle which would have left tracks in a muddy field, and been seen. If she did a Reggie Perrin style disappearance there’d surely have been a sighting somewhere.