Natasha Liu Bordizzo teases an even deeper journey for Sabine Wren in Ahsoka than she had in Rebels. Sabine Wren was first introduced in Rebels as a member of the Ghost Crew. She is a Mandalorian and former Imperial recruit who escaped after creating a deadly weapon that she destroyed after realizing the impact it could have on her own people. Sabine was extremely close with the other members of the Ghost Crew, and Ezra's final message to her was, "I'm counting on you," which she was still trying to understand at the end of Rebels.

https://screenrant.com/ahsoka-sabine-wren-star-wars-journey/