Simple, Glaring Detail

Often, we get hung up on all the weird, possibly meaningless clues (the rag in the tailpipe, etc.) of this case, and we don't see the forest for the trees. But there's one simple thing that's always bothered me and I think it's another detail that points to the tandem driver who has still not come forward:

Does anyone really believe Maura left that day without telling a single other soul where she was going?

I know the quick, easy social-justice-warrior response to this is, "she was a grown woman, why would she have to tell anyone where she was going?"

But, seriously consider it for a second. Do you really think Maura left that day without telling any of her friends that she was planning a trip?

I put this question to women who come to my readings and signings and I have yet to find one who took a trip without telling a single soul, especially one into another state that would take a couple days. And before you step up and say, well I did - I go off on my own all the time - think about it again. Were you going away for days? Did you really not text anyone just to let them know not to call the cops when you didn't show up in a day or two?

What is more likely? That Maura didn't tell a single other person what she was planning to do? Or that she did, and it's that person or persons who were with her that night?