Something that keeps playing on my mind......did someone known to Jessica and the Exxon plan a robbery with a co-conspirator (like a boyfriend), knowing her routine, etc. Did they (either singly or both together) enter the Exxon, and something went wrong - Jessica was able to identify them by sight or voice, escalating it to an abduction.
I can't quite fill the gap between intended robbery to abduction - as the cash was out in full view to take. Maybe they expected more cash on hand (i.e. hoping Jessica hadn't done a cash drop in the safe as there was still at least 30 minutes left in her shift) - she was wanting to leave on time so she had started her closing routine earlier than expected. I'm guessing she wouldn't have the number for the safe so she couldn't retrieve money already put in there (not sure how the Exxon safe would work - just making some assumptions - please correct me if wrong).
As the situation escalated, Jessica was maybe knocked/punched to get her to cooperate. I'm guessing the blood may actually be from a blood nose or broken tooth - wouldn't bleed excessively but enough to leave the blood behind at the Exxon. This injury could have happened intentionally or deliberately, depending on how frantic and desperate the two abductors were as things got out of hand.
I'm also thinking this could link into the possibility that she is still alive and been held captive (or was held captive for a period of time if she is now deceased). If the intention was not to kidnap Jessica, they may have ummed and aahed about whether to drop her off somewhere and risk her talking, or dispose of her. I just hope if this is the case, they realise abduction will bring them more understaning from LE at this point than to take her life.
I'm really questioning now if the van is involved. Seems strange if not involved, the driver would have come forward to be cleared. But as others have said, maybe they aren't local and really aren't aware of the focus on the van in Jessica's case.