[dTal]

Why does she assume that her hair color is at all relevant? It doesn't come up in any of the dialogues. Take a look at what people actually say about her appearance:

"So you’re like genius? But you seem so down to earth!" "After you complete your degree, are you going into modeling?" "You don’t look like you go to MIT." "You look good!" and "But you’re wearing a dress!?"

The most specific comment refers to her clothing. It's not really a large enough sample to be sure, but it sounds more like people are responding to the care she puts into her appearance. Google image search tells me that this is indeed unusual for an MIT student.