Imo, LE must be able to view tapes of car exiting shortly after she was seen on video, I would think? How many would there be at that time? I am guessing that maybe they saw her friend drive off, as he said, since they saying he has been cooperative and is not a suspect. So hopefully they have images of other cars and can ID them.
But on the other hand if they were fairly certain she was taken away or left in a car, not sure how that would fit in with ground searches. I feel like they really don't know either way. If someone abducted her, I think they would drive out of the area immediately.
Jmo
I thought I read where LE doesn't feel that she is still in the area. May have been another case where I heard that, but I'm pretty sure it was this one. If that's the case, that leads me to believe they have evidence (or strong suspicion) that she left, be it another car on videotape during that time or the friend's story isn't adding up. It's important to note that LE hasn't ruled the friend out, and only said that he has been cooperative and isn't a suspect at this time. We've seen similar pronouncements in the past only to be followed by an arrest.
Having said this, I still have the hinks about another male in her life. JMO.