the only problem I see with that situation is that Schmi Skywalker dies in episode 2 which is part of what drives Anakin over the the dark side. Nice idea though. How about this:

What if this is a daughter of Darth Vader? One not concieved by Padme but by a random victim of the dark lord. or better yet a daughter of Maul or even Sidious himself?

Wow! Incredible character design. How's this for a background: After finding out that Anakin Skywalker was the dreaded Sith Lord Darth Vader and had died fighting rebel forces (as she was told by the Emporer in a dream) his mother gives herself over to the dark side of the force.The Emporer trains her in the ways of the dark side (Due to the fact that she was touched by the force when she became pregnant with Anakin she is easily able to master the ways of the force)The anger and bitterness she feels over the loss of her son begins to disfigure her, transforming her into a Sith Lord unlike any before her. She vows to destroy everyone she holds responsible for the death of her son, beginning with Luke Skywalker.

Congrats. This image made Lady Heromorph's Top Images of the Week ending Dec. 12th, 2009.

I was about to say what Darth Paul did. It's strongly implied in Episode III that Darth Plagueis was Sidious' master.

I'd go with Maul?s predecessor since It?s my understanding that Sidious? master was Darth Plageus (sic) the Wise. You?ve got a pretty sweet Sith chick nonetheless. Great work.

Holy Sweet Jesus! Awesome character design. She must have some wicked Sith skills to fight in high heels.