I'm glad you posted this video, it clears things up a lot for me. As anybody with a brain knows, after dark it is easy to see inside of a building that is lit up. This occurred at 8 p.m., well after dark. The entire lobby area where the children were playing is lined with a full height window wall. This would have made it extraordinarily easy for a person to sit out in the parking lot and observe the kids as they played and scurried around inside the lobby area. The church is situated next to a very busy highway. The church is also located close to a nearby restaurant.
Most likely our perpetrator pulled into the parking lot of the church for some mundane reason, such as checking a noisy tire or stopping to text somebody, and was able to observe the kids playing in the lobby through the backlit windows. The young girl he saw moving around inside the lobby caused his sick fantasies to kick into overdrive, and that's when this abduction scheme was hatched. I'd guess he probably exited his vehicle and walked up to the doors of the building to see if any adults were present. This again he could observe from outside the building. Seeing no threats inside the lobby, he most likely opened the front door and motioned Kayla to come over and talk to him. She walks over to see what he wants, and he snatches her up and hustles her out to his car, and then hurriedly speeds off into the night.
This is why LE is asking for the public's help. I'd be willing to bet my next years salary that a motorist driving by on the road either saw the perps car pull into the parking lot, saw him dragging her to his vehicle, or witnessed him speeding away. I doubt if any one motorist would have seen it all take place, but they may have seen one part or another as it was happening. This motorist more than likely doesn't even realize what they were witnessing. Trying to find people who may have been driving by the church at precisely the same time the perp's vehicle was leaving is going to be a toughy.
Having seen now how easily a predator could have sat out in the parking lot and observed what was going on in the front lobby, it makes it much easier for me to buy into the possibility that this was a stranger abduction. I don't think this was planned though, just a spur of the moment snatch-and-grab by a sick and twisted up individual.