As I said, that's why she's refreshing. She doesn't have your standard tomboy appearance when she's older. It's that mismatch that adds to her charm rather than detracting from it.

A girl being a tomboy isn't about appearance, it's personality. I view the scene where she's taking off her track pants (while still wearing the skirt) the moment the teacher asks to be a perfect example that she's still the same. She's prettier now, but she's not at all embarrassed about that behavior in front of others. Taichi called her out about lying in the grass not because she was by herself, but because she'll just lay down wherever she feels like (...and probably with disregard to whether or not others can see up her skirt). The rest of her melancholy appears to be because she can't play karuta with anyone yet.