ikally
I get the feeling that she is of pure heart right now, but she'll be used against Mako in the future.
Maybe Amon or his goons will kidnap her and use her to lure Mako (and therefore the Avatar) into some compromising situation? Idk.
I keep thinking onto how Jet was brainwashed and did stuff at Lake Laogai (spelling?). I can definitely see Asami in a situation where she gets held hostage or brainwashed... Then Mako/Bolin/Avatar must go into a dangerous situation to save the day...
I don't think she'll be kidnapped by Amon unless Asami and Korra become the dream team buds I want them to be. I think Korra hates her right now, so Amon won't be kidnapping Asami anytime soon, even if Mako (and in turn Korra) will go after her. He has no way of knowing that Korra will actually cut of her testosterone-dominant-jealousy-lady-balls to try and help Asami. If he were to kidnap anyone (or brainwash anyone for that matter) it would most likely be Mako, Bolin, Tenzin, or his family. They're way closer to Korra than Asami is (for now anyways).
But, to rebut my own argument (I'd never make the debate team since I keep doing this), it is still a YET. We've only seen Asami for one episode AND she's only met Korra once. Korra was very hostile towards her, but it could have had something to do with not seeing her team in a while and some of that emotional turmoil from her Amon-phobia. There is also supposedly a leaked image of Korra and Asami tearing their way down a street like crazy in a Sato-mobile. In the future, they may become close and Amon may take advantage of that, but that is in the future. For now, Asami is only of romantic importance.