Be very patient. Do things together in large groups first, and always act courteously to everyone, even when she's not around. Don't push her to move faster than she's ready.
Sometimes the best thing is to do a reversal. Which means YOU play hard to get. Sometimes a girl will do that to see how interested you are in them. They will often times play this game and if she notices now that you are interested in her the harder she will play "hard to get".
These girls are complicated lol! The best way to get them is to be independent and friendly. Its maybe hard to do when you have feeling for someone but hot chicks like it i swear on god! Show no interest for her is the only to get her. Girls are complicated sometimes!!!
You have to be that nice sensitive sweet caring guy. You are going to have to just speak to her let her know that you are interested in her and ask her out.
Probably your approach is not what she's looking for, study her for a short while and understand her likings and then if she's a soft girl, then approach her with flowers!!! simple...