Has the mother revised the time of 5-5:30 or otherwise contradicted what was said on the radio show?
Take away the time stamp on the video and there's nothing that suggest a 5:30 or 6:30 time frame, it could be either or. Unless I've missed something the 5:30 time is the correct one according to both the mother and the clerk.
The mother has given 2 different times. She first said Jessica left the house a little after 6. Then after AA said the video time stamp was off by an hour, the mother changed the time Jessica left the house to be an hour earlier. So, we don't know which is the right time. JMO