What happened to Aura between the events of G.U. and the movie? Aura seems to be missing in all if not the majority of the //G.U. anime and games, //Quantum, but makes some appearances in the //Beyond the World movie? 

What happened to her between this period of time?
In The world:R2, Aura is missing because she is trying to let the players act by themselves. She acted tough by creating the 3 azure knights (azure kite, balmung and orca) and helped haseo during the last fight of .hack//G.U. game series.