Isolate. Bring in some music you think she would like and hasn't heard before and tell her when your group is breaking off you want to show her it. Talk about the music a little more then invite her out to a concert where that type of music is playing.
Why do you care if she knows you like her? Show intent.
That's smart I would invite her to a concert but we both like american rap which rarely comes to the UK mainly in the summer. I'll try and talk to her about music and I should show intent.