Huh. You and Lindy hit it, I'll bet.
I'm was a Certified Drug and Alcohol Addictions guy, State of Oregon, Level II, and I didn't pick up on that. Makes perfect sense.
Travelling that far in one fell swoop, the obsession, the half-assed planning, the sense of omnipotence necessary to implement the plan, the urgency of having to confront her NOW could well be meth. Elements of a psychotic break, which could come from longer term use.
For her sake I hope that's it. It's the easiest explanation for such screwy behavior to treat.
My heart goes out to everyone involved. And those affected but not involved.
Arf