In this space, one's sense of time flows extremely fast. 1 minute in the outside world feels like a month.
While enclosed in this space for 72 hours, she tastes both unbearable pain, and simultaneously sexual pleasure beyond any that has been experienced before.
(Even a robust warrior wouldn't keep their sense of self beyond 5 seconds.)As a result, all prior memories and personality are thoroughly erased, and she is converted into a living husk with absolutely no remaining emotions.
After this, the one who becomes her master will overwrite her with some convenient memories, and use her as he pleases for the rest of her life.