There isn't any one thing but instead lots of small steps in the right direction. The steps are so gradual that now we are in an easier place, I honestly can't believe we made it through the really difficult times. But before I paint some unrealistic rosy picture, things can still be hard and we have periods where we go backwards. Things that helped - a diagnosis adhd/asd, medication for adhd, the end of school, doing a subject she loves at University and me learning to listen and not just bombard her with suggestions/advice (unless she asks for it). There have been plenty of other things which may have slightly helped or did nothing but burn a hole in our wallet which I won't list. I wish I could give you something more concrete but can only offer you our experiences.