So I haven't really rummaged through /flow/ much at all,so I'm not sure if anyone's proposed this before.
At some point or another I was reading something that brought up "flow."
Flow is where you focus so completely on one thing, nothing else registers on your radar. It's also called being in the "zone," and the concept isn't really a new one; it's existed in various religions and stuff, bla bla bla now I'm just writing an essay on this. Go look it up on wikipedia if you really need to.
http://en.wikipedia.org/wiki/Flow_%28psychology%29You can probably see where I am going with this, now. Sabitsuki is so grossly enveloped by her activities on that computer, nothing else matters. She doesn't even see the outside world while she's on the computer. There is nothing beyond what is on the screen.
She gets so wrapped up in the world she's found or created on the computer she doesn't even realise how dark it's gotten, how much it's hurting her. At this point, it's more like hyperfocus (
http://en.wikipedia.org/wiki/Hyperfocus) in that she's not overjoyed or cheerful about it anymore; she's not happy, but she can't leave it be.
It's not anything groundbreaking or anything, but that's my theory.