Abused twelve year old Molly must marry Ben to save lives. Adia, a scientist who sees futures for certain people, showed her their lives up to their 40's. They were happy. Molly's healer colony saved people whom healer colonies in other galaxies could not.
Earth doesn't know Zheien don't make love and she can't tell anyone about Adia's prophecy. But, because of it, leaders of the Alb System created the Rainbow Unwell Colonies. All they need is Molly.
In that other future, at 15, it was her idea to start a miracle healer colony, and run it with disabled slaves. All she needs is for a hundred people to choose her to lead them. And her husband, to help her use skills her body is too young to control.