I was just confused (and still am a little confused) on how she acted like she was fine when we got breakfast before I left (apparently that was after she saw the guy). We were even fine the next day I was two hours away. That's why it seemed out of the blue to me.
She probably was fine.
Compartmentalization, disassociation, denial, or delayed reaction could and often does cause that sort of thing to happen. It's what people do when they go into survival mode.
It's not like when I'm terrified of dropping my son of at the first day of school wih new parent jitters so I put on a big smile and get really excited for him and
act fine for his benefit. It's not a pretend thing, or a manipulation thing, or even a willpower thing.
In 3:4 of the above options... (Compartmentalization, disassociation, denial) ...The stressor never happened. Not to her mind, in that moment. She would have been completely fine because she'd either compartmentalized things, disassociated during either the stressor or her time with you, or zip/nada/zilch... Denial! It didn't happen, it doesn't bother me, I'm fine! :D. It's still different than when I
know I'm not fine, and I'm putting on a brave face. Worlds apart different.
Delayed reaction, meanwhile, would also mean she was fine. Stressor happened, she was aware of it, she was coping just fine, even expected that to be the status quo. Cool. I'm fine. Awesome. And then fell apart later.
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A lot of the themes here in this thread, you're a smart chick, if you stop arguing for a moment and take what people are telling you at face value; that these are not decisions people make, these are symptoms of a condition. Like depression isn't just a "Cheer up!" away from being happy. Depression isn't just being sad, PTSD isn't just being upset. PTSD is a neurological condition. I get that you THINK you're asking for a teeny tiny little thing (why can't she "just")... Dozens of posts here telling you that it's not a little thing. It's a pretty damn big thing. Like asking someone not to stutter. Sometimes it's possible, sometimes it's not. And the conditions surrounding why they're stuttering in the first place are pretty key. Make someone with Tourette's completely stressed out? More tics are going to pop up, not less. I'm using other disorders here, on purpose. PTSD is a disorder. Symptoms can be managed, but they also can be made worse. A lot of the things you're suggesting are things that make symptoms worse, not better. Hence a lot of the flak. Believe me, we've tried to "just" do certain things... And those things are made worse by those methods. Not better.