@daithimacthomais it was in Rebels. Ezra left Ahsoka on Malachor where she dueled (and was apparently defeated by) Vader in the crumbling Sith temple. Later back on Lothal, Ezra entered the World Between Worlds via the Mortis mural. There he saw a portal with Ahsoka on Malachor dueling Vader in the crumbling Sith temple, and pulled her out as it crumbled. Ahsoka was pulled through time and space into this in-between realm. She later went back into the Malachor portal.