Kairi Sane is no longer a WWE Superstar, but she is still under the company umbrella. She moved back to Japan where she is a company ambassador and trainer.
According to the Wrestling Observer Newsletter, STARDOM wanted to bring back former stars for a special event on March 3rd at Budokan Hall, notably Kairi Sane. WWE still has her under contract, and she tried to get this appearance approved, but it “got nowhere.”
They haven’t been back since. Other plans include trying to bring back stars from the past, most notably Kairi Hojo (Sane). Hojo is still under contract to WWE and she went to the Japanese WWE office for help in approving doing an appearance on the show but this got nowhere
Kairi Sane got married when she returned to Japan, and she is no longer wrestling. She wouldn’t likely get physical with her STARDOM appearance, but WWE apparently didn’t give her the green light to appear. We’ll have to see if they change their mind about this in the future.