It is an interesting statement and can throw you off your game when someone tells you they have done it somewhere, but a good thing to do will be to put them on the spot and say "oh really, where?" it shows a lot of balls to call them on a potential bluff and could be risky but if she does explain where she heard it then say, "well that's cool what did you learn?" Let her say what she has to say then say "How did you feel when you learnt all these?" This will allow you to tap into her emotions which girls love and it is an attraction switch when you can convey and relate to emotions!
I'm no expert at pick up, I'm really just a beginner but what I put here could be total genius or be total crap but its worth a shot and if things do take a turn for the worse than you have lost nothing, the world is not going to end, it was just slightly bad luck you got a girl whos already been gamed with the cube, theres no shame in it. Just keep calm and composed (even when I get rejected I just laugh inside at how dumb the girls are for not giving me a shot).
You said in the above post that you where pretty good at online dating, I would like a bit of help on that as I live in a slightly retarded area of England filled with dumb girls who don't know how to have a good conversation, though I have managed a few good conversations but I would like an alternative to it!