Don't Try to Impress Her

Just like the title says... "Don't Try To Impress Her".

Once you start doing this, you've lost the game.  She knows you're "trying" and this is not an attractive quality to have.  Relax, and just be casual - it doesn't matter if this interaction with her goes any where or not -- and once you have that mindset, you'll find that it does get you somewhere!