The story
Shelia had told Mary and David that they had picked Skylar up around 11 p.m. and dropped her off again around midnight. That turned out to be inconsistent with what was seen on the images from the security camera. This showed that Skylar did not leave the house until around half past one in the morning.
Shelia had been intoxicated, of course, so she may have been wrong about the time. Unfortunately, after half-past one, there was no sign of Skylar in the images, no matter how closely the parents looked. Shelia helped to sort through the images. Unfortunately, Rachel couldn’t help, as she had left for a Catholic summer camp the morning of Skylar’s disappearance.
That was quite a coincidence…