Here's much more about that message.
Editing the book, today, I came across the message again and noted this passage:
Sometime between 12 MN and 1 AM Maura driving her Saturn struck and critically injured the UMass student Petrit Vasi leaving him for dead.
And I thought 12 MN was strange. I don't know anyone who writes it like that.
But guess what? That's standard subscript for... a nurse.
Looking back on the message, one other passage stands out to me.
Maura’s being asked to leave West Point and all the ensuing criticism by her father was the beginning of a certain line of thought for Maura, culminating in her leaving on Feb 9, 2004 to start a new life unencumbered by the constant criticism of her father.
"the beginning of a certain line of thought..." sounds to me like a distinct grammatical twitch that this person uses in conversation. Is it familiar to anyone?