I believe this is right - IIRC Tony said she stayed the night of the 26th and got up early and "left him" Then she called later and said she was out of gas.
So - what does early mean to Tony? 5:00; 5:30; 6:00; 6:30ish? And then, what was she doing from 7:00ish to 11:00ish? How was she getting around? Were the freezer pops still frozen?
The lady said she saw the car there when she arrived at work. If she normally gets there at 7:00, but she was late that day for some reason, maybe she didn't get there until 8 or 9:00. Even still there is a period of time where Casey can't be placed.
Someone gave her a ride that morning at some point in time. I don't think Casey would walk far, but maybe someone did live close enough that she could go there?
Salem