This is completely off the topic of the rag....ahh the elusive rag in the tailpipe. But, is there concrete proof which direction MM was traveling on 112? I know it's always been stated that she was traveling East, but what made that determination? Skid marks? Eye witnesses? Do we know for sure that she took I-91 North? Only asking, because of that 1 hour discrepancy of time of how long it would take to get to the crash site from when she is believed to have left Amherst. Just a thought, but you could make it from Amherst to near the Londonderry area and then to the crash site on 112. Which, thought not the most direct route, would take you onto Vermont areas for which she had mapquest directions.
I'm just theorizing here to try to make sense of and think of the Londonderry ping in a different way. It really doesn't give much time for her to stop in that area though. Which, is a bit out of the way for such a quick stop. And, where her phone was, I'm assuming, showed a ping along the 91 route when the Londonderry call happened? It's WAY more likely that she drove straight to the crash site from Amherst and stopped somewhere for gas, food, etc. for an hour, whether alone or to wait for a tandem driver to rendezvous there before continuing to a destination unknown.
The more I get into this idea, the more I talk myself out of it. Wish they had released those mapquest directions and cell phone records. Sorry, been lost down these rabbit trails for far too long. I'm trying to think outside the boxes and assumptions.