I remember a Literotica story about a factory that made lifelike "dolls" to sell in stores. What they did was take volunteers, permanently wipe their consciousness so from their point of view it was like dying, and reprograming the body as a mindless servant with its own inbuilt surface-level personality. Depending on the body, they were sold as maids, nannies, or sex toys. In the story, lots of young women tired of life were eager to embrace oblivion without the pain and uncertainty of suicide.
I was thinking that this could've been the ideal outcome for Katie. She would stop existing and be "dead" but her body would live on and warm some chud's bed.