As it turns out, Ahsoka did survive the duel with Vader on Malachor, but not because she outfought him. Ezra rescued her by going back in time and yanking her to safety so Darth Vader could not kill her. Ahsoka is still alive.

Does Ahsoka die ever?

Over time, she matured into a respected leader, contributing to key Republic victories like the Second Battle of Geonosis and the Battle of Mon Cala. She even died during a series of events on Mortis, but the Daughter, a Force wielder who personified the light side, sacrificed herself to bring Tano back to life.

What happens to Ahsoka Tano after Rebels?

Ahsoka once again disappeared after this taxing moment; she wouldn't re-emerge until the epilogue of Rebels, set after the Battle of Endor in Return of the Jedi and the fall of the Galactic Empire. In the aforementioned Star Wars Rebels' ending scene, Ahsoka reunited with Sabine Wren in Lothal.