I tend to agree with her "thinking" and feeling, as you described in the last post, and this above. I do believe there was, indeed, a "wrong answer, Travis" moment.
But I get stuck on the "she didn't go to kill him" when I think about all the actions and her behavior to get to Mesa and basically not leave a trail: had to stop and borrow gas cans from a former BF; seemed frantic and intent on going there; didn't leave a receipt trail in AZ; her cell phone was conveniently "off" on her driving into AZ and while in AZ (wasn't it off for about 20 hours or so?); rental car...with the plates upside down; she's supposed to be in UT to see a potential new fling, Ryan...but she never calls at any point at this time to state she's been delayed and won't get there when he's expecting her?, etc.
She pre-planned so many details. Why?