Not that her word can be believed (or that my memory is accurate lol) but didn't Travis catching her snooping through his phone happen before their "break up" at the end of June '07?
June, 2007. Snoops his phone, goes on trip with him anyway, suffering silently and Christ -like , confronts him, the end.
July 2007. Moved to Mesa despite his strong objections. Stayed at Rachel's then found a room even closer to Travis. Travis starts dating Lisa within a week of JA "ending" "official" relationship.
August, 2007. JA has major regrets over confronting Travis. He was supposed to feel consumed with guilt, owe her more, and get more deeply entangled. Instead, he moved on to Lisa.
JA wrestles with dark thoughts for all of August 2007. She's very aware that's going on. She writes about "playing out horrible scenarios" in her mind. And "I've got to douse my mind in some kind of mental Round-Up, kill all that is not serving me, eradicate those thoughts."
On August 26th she writes she didn't take her journal to LV convention because it would be a "horrible nightmare" if it fell into the wrong hands.
She talks of suicide, of going away for a weekend to spend time with "some very successful PPL ring earners"(she doesn't go), and that she's trying hard to remember how she feels is not Travis' fault. She is very often over at his house, whether or not he's home, and she is very often on his computer.