I'm writing something set in the modern day and am scratching my head about how to cover my "clue tree" bases.
A is a rogue law enforcement agent fighting a Mythos threat. She's pretty smart but not brilliant. To avoid a Mythos threat, she has concluded that it was necessary to abduct a small girl from a public place. She has arranged to hold the child (in her company) in a motel room in an utterly random place with no connection to her. She abandoned her own car, switched to a rental (she had to use her own identity to do this without drawing suspicion). The car is parked near the motel (she does not want to hurt the child if possible, just keep her out of circulation for a few days). Diligent research by the investigators will reveal who she is and confirm that she is the kidnapper. They will be able to trace the rental car to her and might be looking for it.
What sorts of bread crumbs might she have of necessity, or inadvertently, left behind? I've thought of toll records (she's smart enough to try to avoid cameras). I need to get the investigators to the cheap motel. Thoughts? Do I have any alternatives to the proverbial Amber Alert/plastering her picture all over the media that might allow the investigators to get the drop on her?