The world is matriarchal. I remember it starting with a girl running away from home because she was scared of being "chosen" to become a priestess (??). Technology was actively discouraged and time/energy went towards improving healing powers. I think the "priestesses" cured the ill in the villages. There was a research space station that was watching them because their planet was not being consumed by evil like others in the universe. I can't remember much more except that at one point she denied doing something 3 times which resulted in her being somehow special. If anyone has a clue - it would be greatly appreciated.