K-Blade
More of a self-imposed exile tired of the fighting and the loss of a padawan pushed her over the edge. So she gave up the order and now wanders the galaxy in a vain attempt to find her inner peace. She no longer cares about the war between light and dark, as it has happened before, it will happen again. Maybe interacting with a kindhearted soul might be enough to pull her away from the presupposes of oblivion that she finds she self at. Or something like that.
Hope you can pull it off better than everyone else who's tried a grey Jedi.