My feeling is that Reina's being alternative. She's not trying to be grown up, nor is she trying to climb to the top of a social ladder. She's trying to be special for special's sake. She rejects the dime-a-dozen upbringing that the Japanese are infamous for.

The point hits home where she didn't even care about the pretty scene, just that she's doing something no one else would.

Her attraction to Kumiko's kind of weird though. Actually, everything that goes on between them is weird. Hot weird, but still weird. I'm in a state of confusion whenever I'm watching it. It's mainly how Reina's advances just come out of nowhere (like that hair-throwing scene at the traffic lights last time)