In general, it is unreasonable to believe that Maura was forcefully abducted near the accident site. Because to assume that she was, you have to assume the unlikely:

That Maura was forcefully abducted without her screaming.

Note: This does not eliminate the following possibilities, but I don't find them convincing

That she:

1. Didn't "know she was being abducted until it was too late."
2. Was "blindsided knocked unconscious from behind"
3. Got "hit by a vehicle at the scene itself and thrown into it quickly"
4. The idea that a tangent driver abducted her does not address the First Law of Tangental Motion discussed here: https://www.reddit.com/r/MauraMurrayEvidence/comments/4xxqyl/the_first_law_of_tangential_motion_opinion/

OK - edited to list the above points Originally stated: "In general, is unreasonable to believe that Maura was abducted..."

Note: The presumption Maura Murray was abducted (by a stranger) requires we assume that she was the Saturn's driver.

1. It she was a passenger, one would presume that the Saturn's driver would have notified the authorities that she was abducted.

2. On the other hand, if there was a driver and she was the passenger, the Saturn's driver has not come forward.