The Justice League trailers have since shown us that she’s decided to work with Bruce to recruit other superheroes, but thanks to Wonder Woman, we know what pushed her to help the Caped Crusader.
Now she’ll be be instrumental in protecting humanity when Steppenwolf and his Parademon army invade Earth to search for the three Mother Boxes.
Although by that point Diana was friendly with Bruce, it was unclear whether or not she was on board with his plan.
By reflecting on her past, she was able to move her future in the right direction.