I think there should be 2 significant place, possibly 3, that LE should be able to determine by looking at records from her phone and her Fitbit. The first would be where she was (possibly) abducted; the Stats from the Fitbit should have slowed down some once she stopped running, but her location changes should have sped up if she was taken in a car or stopped if she were taken into a home, field, etc. The second place would be where the phone lost contact with the tower. If the Fitbit was still showing normal (at least somewhat) stats when the phone quit, it's likely that the phone was destroyed, turned off or the battery died while she was still alive. It's likely that she and the phone are likely to be somewhere else. (MOO) If the Fitbit stopped transmitting anything before the phone did, it's possible that she did die in that spot; however, it could just be that it was turned off or the battery died.
I don't really think any of that is earth-shaking news, but I'm just wondering how man, if any, of these points have been pinpointed by LE. I'd really like to know what conclusions they've come to if they've found 2 or 3 of them (or even one, I guess)