EDLB :
A reason might be that something went wrong with her Bat powered GPS like a Garmin
Could be, there are lots of photos of her on Internet, some in a Caravan cockpit, with a small hand held Garmin AERA500 strapped on of top of the glareshield. But not sure how old the photos are and if it was the one in question though.
Looks like the preliminary report will be out soon, whether it says a lot remains to be seen , but at least the facts will be public.