Her bag looked 'packed', all her things she would need for her flight are in the room, and to take a long walk instead of getting ready for the flight home has seemed strange from the beginning, except they supposedly have footage of that walk.......but if it's anything like this, I don't believe it.
I noticed that too. The Big Green Bag looked very stuffed in the shot of it in the police car. More than we see when she is usually walking out in NYC or in the cafeteria shots.
That's why I was reviewing flight schedules to try to determine how soon her upcoming departure was - which could lead some insight into how much time she thought she had before departure. Her arrival time was stated as 4:55 pm Jan 22, which means she was on the direct (non-connecting) UAL 905 flight that departs IST Jan 22 at 12:05 pm so she had about 24 hours more in Istanbul from her last reported sighting on the Sekaci or Sayanbunu CCTV.
IF that sighting was correct. You raise a great point about the Jan 21 footage. However, I think LE has a pretty good profile of how she normally appeared and I will trust that they were correct in their identification.