Well, I suppose Ahsoka is actually an agent of the Dark Side, sent to turn Anakin into the Palpatine-bait we see in RoTS. It's a Sith technique, used by a long-dead Lord of the Sith named Darth Jorj Lukas (read it). The name of the technique is called Lu'kas Plotkai. This means that disregarding normal concerns and continuities, the Will of the Sith Lord be done >.< Honestly, Ahsoka is really a big sore thumb. Lucas might have really needed to straighten things out a little -.-'' Probably low importance. I doubt she has a real major impact in shaping Anakin because if she does, this major event would have to be referenced in RoTS and the other novels. But then again, one can never underestimate the power of the plotkai.