I just give girls my full attention, and make them only care about me. Does she sit near you? Here's what I usually do:
-I switch their books, so when they open it, and notice it's mine, they have to ask for it back.
-When they answer all the questions in one day, and don't answer one. Say in a jerky attitude "I'm surprised you don't have a comment on that one."
-Stare at her, and then when she notices continue staring, and when she looks down and looks back up, keep staring until she says "Quit it." 3 times or she sounds annoyed.
And go from there. Stuff like that just naturally comes to my head after I did it for a while.
Then when she wants your attention, just go one day on her attn, and then the next day off attn. Make her wonder about you.
Just suggestions.