Very good 'up to the minute' twitter feed from an anchor covering the story for CBS19 in Charlottesville.
https://twitter.com/RachelCBS19
A couple of insights I've picked up from her tweets:
1. No outdoor cameras at the theatre. No employees interviewed recall seeing her inside.
2. When FBI opened the car door, the alarm went off - meaning that whomever closed the door last locked it up. Would have had to have used the key FOB to do this.
3. She is told that FBI is leading the investigation. (Which is odd that they have assumed jurisdiction, unless something they know gives them this authority over local/state LE)
I'm thinking she parked the car there and met someone. Something bad may have happened later on, but I'm thinking she knew this person somehow and went willingly.
Hope this is the case, as the chances for a good outcome are greater. Then again, with FBI taking the lead, it doesn't look good.