She appears in the following:
* Clone Wars (animated series)
* Rebels (animated series)
* The Mandalorian (live-action series)
* The Book of Boba Fett (live-action series)
* Ahsoka (upcoming live-action series)
Her story continues in these stories, and she is very much alive.
There are some fan theories about Ahsoka's potential fate, but none of them are confirmed by official sources.