How can the switch be turned off which seems like overnight? But turning the switch back on may never happen or take who knows how long.
That journal could have been much worse in many directions. She could have written that she never wants to see you again, be glad it's not worse than it is!
She actually sounds very confused and like she's trying to convince herself, I wouldn't dwell on it too much, you already knew what state of mind she was in before you read it. You did learn about the terrible cost of snooping however!
The fact that she hasn't taken any action or made any further changes underscores that she's confused. While you feel like she made a decision like turning off a light switch, she has actually been dwelling on this and NOT telling you for a LONG time. The only quick part about it was the point that she told you. That's why it can't be quickly undone.
So she's on the fence, she's evaluating you and your actions and trying to make you fail to make her decision easier. It's much easier if you push her out the door than if she just decides to leave on her own. It's much more convenient when the other person is at fault or at least it's mutual.
So what do you do? Continue to DB. Continue to 180. Keep your cards close to the vest, don't discuss how you are feeling. Keep it business. Be friendly, be courteous, treat her as you would a friendly co-worker and expect no more than you would from a relationship like that. Get out and GAL. Make new friends. Be vague about what you're doing. There was a poster here with a WAH. At one point, he called her on her cell phone and she was out at a bar with music in the background, people laughing, and an obvious good time going on. That was like gold -- that started his wheels spinning and eventually they reconciled. I'm not suggesting you stage something like that, I'm saying "go out and live that life" and if you do, she will notice.
Accuray
Married 18, Together 20, Now Divorced M: 48, W: 50, D: 18, S: 16, D: 12 Bomb Dropped (EA, D): 7/13/11 Start Reconcile: 8/15/11 Bomb Dropped (EA, D): 5/1/2014 (Divorced) In a New Relationship: 3/2015