It doesn't really have to be rational. As long as she thinks she's degrading herself the coping mechanism is serving it's purpose, so time is irrelevant. Coping mechanism don't work on a consciousness level.
It's not really that uncommon in real life.
Da fuq is this guy even talking about? Someone please dumb down his comments or make him GTHO.
I actually understand what s/he's talking about, but they seem to be hostile/aggressive with their tone so I don't see a point in translating it, but I'll do it anyway.
They're saying that whatsherface, Muramaki, has issues and represses them, so she's putting on the strip show and being otherwhatsherfaces plaything/fantasy as a way to punish herself (for what, who knows, her own perceived lack of worth through the BS she puts up with?) through humiliation, or sexual degredation, or whatever.
I do find it interesting that she's been "testing" (imo) Moritani's character during different snippets of the time stop, maybe to get a better sense of her , and (more imo) she likes being around Moritani because Moritani doesn't really matter in "their world" anyway, since she makes herself invisible to their peers via the time stop. She's a safe place for Muramaki, even if she hasn't realized it yet (though a part of her recognizes it on a subconscious level which is why she acts 'different' around her)
That's just my 'kyaaaaa emoticon fluffspeak' though (to quote mr.hostilepants up there)