This is where the subtle references to previous canon really came in handy for us. We pretty much used the first two seasons to help sort of push the rest of the girls in the direction we wanted them to go.
At one point, the girls realize that Twilight was ultimately the spark that connected them together. Their journey to find Twilight isn’t really one about simply trying to have her go back to save the day, its because the girls feel like they’ve taken advantage of what Twilight has given them as friends.
The movie chronicles the girls’ journey of selflessness to bring Twilight back because they realize that they need her. Their friendship is so powerful that they realize just how sad and empty their lives are without her. The movie uses the Elements that the other 5 were given to develop and express their personalities on a more human level. Not literally mind you, but you know what I mean.