Ahsoka Tano; Mightiest Force Wielder (Book 1: The Rise)

The dark side crafted a plan, and the plan requires Ahsoka to become a mighty force wielder, one of the mightiest actually.
After the fight with Darth Vader, Ahsoka is locked in the temple of Malachor. The dark side is calling for her. Mercylessly calling for her and luring her to subdue to it and become a Sith.
Will she fall to the dark side?
A former padawan however is as much wanted by the empire as the Jedi and likewise hunted as much. Anyone with her will get under fire. The Jedi codex does not allow for attachments, a Sith by nature does not have attachments, yet, she loves a man, but their love is under a dark star. Used, rather abused, by the dark side for its own plan.
Guided by the force, she finds Yoda on Dagobah. Seeing her yellow eyes and her new red magic saber he greets her: "Grown up you have, no youngling anymore. Strong you have become, powerful, forceful - and dangerous. Lady you are. And Sith you are. Dangerous Sith Master."
The empire wants her, Sidious wants to make her die in agony and Vader wants to make her submit or finish her with his saber. One day Ahsoka comes to the understanding, that she cannot hide and run away forever. She has to call out Darth Vader to settle things between them once and for all. They have to fight for life or death - death or glory.
Darth Vader will survive their duel, as we all know, but what happens to Ahsoka?