The big question still remains: Did she leave her cell phone behind on purpose, or did she leave it behind by accident ?
I'm sure if there were any texts or incoming calls made during the last hour she was in the bar, the cops would be all over it by now. Since nothing has been mentioned, I have to assume that there was nothing of note left behind on her phone.
Theory 1
If this was an abduction, the only real way I could see it happening would be if she saw someone she knew walking down the dark street, stopped to ask if they needed a ride, and possibly took a detour to get this individual home. Much to her surprise, the individual attacked her (maybe he was drunk) and demanded to be taken wherever. So where is the car ? Wherever he hid it. Garage, storage shed, barn, a grove of trees, under a big tarp in the back yard ?
The fact that she didn't have her phone with her, might be the luckiest thing that ever happened to this perp., since they can't even track her final pings at this point. Maybe the reason this happened was because she DIDN'T have a phone, and once the perp. realized it, she became a victim.
Theory 2
She left the phone behind deliberately to insure that she could not be tracked. A lot of people are not technically proficient, and might not know if a cell phone could be tracked if it was in sleep mode, if the "off" button had been activated, or if the battery was still in it. Someone that was worried about that, might just leave the entire phone behind. Why would she abandon the phone and run off ? Your guess is as good as mine. People do it all the time though.
I'd be interested to know if she knew anything about the Jennifer Huston case, or if she followed the story along as it was playing out. I remember thinking to myself after they found her, that there may be copy-cats out there that decide to do the same thing.
Keep in mind, there is no activity on her ATM withdrawals, credit cards, or bank accounts. Unlikely she is traveling.
Just to take a stab in the dark, I think it is someone local, somebody she knew and encountered that night after she passed the camera.
I admit it's a small window of opportunity, but none of us know who the perp is or what type of planning may have been involved.
This may have also just been a crime of opportunity, as stated in theory 1 above.