Spoiler ShowContrary to many opinions, I think Strelitzia is still dead. She couldn’t become nobody , since nobody becomes the people who gave their heart to darkness. And Lauriam’s sister was exactly what they killed. Her heart flew into the sky. I have a theory that the white robe that we saw on Strelitzia is uniform worn by the souls of deceased people who fell into Kingdom hearts. It is known that white is a symbol of death. Hearts painted white from the fallen owners of the key flew into the sky after the end of the keyblade war.
We are getting closer and closer to the topic of what Kingdom hearts are. And I think that Strelitzia will become a kind of "Spirit guide" for the main characters.