She's not exactly thinking, as in rationally deliberating. She's reacting to a vague uncomfortable feeling, the same kind of revulsion we get when we see Hasidic Jews with their little 'payos' and strange hats. Or the feeling you get when you are out in public and pass by a black mother and her pack of wild animal children, putting their hands on everything they see while she pulls the cart with one hand and blabs on her cellphone with the other.
It's related to the feeling you get when you see a bug moving on the floor or the wall - a small thing with many legs that all move together in unison. It gives you that feeling because it doesn't move in a way that seems natural. It's too small, and it's legs are too small to cover that distance that quickly. It makes you feel gross.
You get this feeling at seeing the way a snake moves. It's body seems to move from side-to-side, and yet the whole animal moves forward.
She's responding to something she knows is not her, and which is so different that no matter what her ideologies might tell her, the truth is outed by her body and her expression. She's responding to what, to her, amounts to bugs nearby.
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