Hrm. Well TX had power over all technology. A force strike vs a creature that could
1. Disable technological devices at a thought "ie. vaders arm, the lightsaber"
2. Turn any part of her body into an energy pulse cannon, having a form that was similar to liquid terminator.
3. It took the energy core of a t-800 to destroy her, something the equivalent of a small nuke.
4. Highly regenerative abilities.
5. No force choke.
Has vader ever used Sith Lightning? I know the emperor has, and that other bearded guy (never read the comics so i don't know) but even if she's hit by the lightning, I'm not sure the voltage would be enough to down her. Hell she might just reverse the electricity back at the costumed freakshow.
I'd give the robot the edge in this myself. If vader tried to hit her with the saber, she'd stop his arm from working, and shut the power down to the saber. She was like.. cyborg superman, but to a lesser extent. In fact she was a ripoff of cyborg superman, now that i think about it.