Thank you.
Though, in truth, there is no light or dark side of the Force. The Force is simply there and itself. But it is what the person has in his or her own heart, and what they are willing to do, that makes the difference.
Kreia is neither Sith nor Jedi. She was a Jedi Master at one time, and she was also a Sith Lord (or Sith Lady to be exact) at one time. However she found that neither code or dogmatic view held much truth.
And you have just proven our point. Trying to kill the Force would make her no more a Sith than it would a Jedi. Remember, the Sith live, hunger, and die for power. The power of the Force. No, that was not a Sith thing she was trying to do. It was the polar opposite.
Yes, she did use the PC as a means of getting revenge, but she did so all the while fulfilling her primary goal. She felt that the Jedi Masters and Sith Lords were too powerful - yet too ignorant of the Force and common knowledge - to be walking around with their power unchecked. She tried to, in a sense, bring balance. And she knew that if her ultimate goal (killing the Force) was not achieved, then she atleast would have done something.
Finally, someone who agrees!
On a slightly related topic: One thing that bothered my about Episode 3 was the fact that the ability to conserve or return life was "dark" because it was unnatural. All Force powers are "unnatural", including healing powers (which is light). Perserving life is simply an advanced form of heal, so wouldn't it also be "light side"?