Kind of Knowing Someone, but Want to Get Closer?

It sounds like she's shy. My dad had a joke with me that whenever he asked me about how anything was I would just say "good" and leave it at that. Not because I wasn't interested, I was just quiet and didn't really know what to say. Keep trying to initiate conversation- maybe something beyond how her day was. Sports, music, books, homework, weather- anything, really. Eventually she'll get over her shyness and actually talk to you, and I promise you she'll appreciate you immensely for being her friend, whether or not she likes you romantically.