With the creation of The Clone Wars animated series, the characters introduced became canon. So I've been wondering, after the series ended, nothing is ever heard of of Ahsoka Tano. She simply leaves the Jedi Order behind and walks off into the sunset. But what ever became of her? One would think that a former Jedi with that much talent and potential would assist Yoda and Obi-Wan in taking down the Empire. So why did she not resurface after Order 66 was carried out? Why did she not help the Rebels fight the Empire?
She is a member of the Rebel Alliance.
As of Star Wars Rebels Episode 1x13 "Fire Across the Galaxy", we know she is a member of the Rebel Alliance. It stands to reason we might be seeing more of her. (I thought about adding a Rebels tag to the question, but that would negate masking the spoiler - but should probably be done in due time.)
From the canon, we never learned the fate of Ahsoka. After she walked away from the Order, we never learned what happened to her. There are many possibilities:
She was killed by Empire.
She turned to dark side to secretly assist the dark side like Inquisitor.
She heard about Order 66 and went into exile.
She did really assist Rebel Alliances.
Also, I want to point this out that you shouldn't specially treat probable survival of Ahsoka Tano. There were hundreds of Jedi in the Galaxy who survived Order 66 (Kanan is one of them). None of them assisted Rebel Alliances or maybe they did. We just don't know.
She really did assist the Rebel Alliance. Source:
S01E13 of Star Wars: Rebels TV series