Ultimately she was forced to choose SNSD or BLANC.
SM got tired of waiting and chose for her. She was going to promote with one more album, but SM kicked her out. She just wanted to run BLANC and be apart of SNSD, but SM wanted her to be 100% focused on SNSD. Even though SNSD only promotes for like a month a year so idk I don’t think it wouldn’t made a big issue. Read articles for more info in case I missed something.