Not even a year after the shapeshifting incident, during the summer break, Robin got bored while hanging out with the adopted Wayne family because Dick, who was supposed to watch them, fell asleep while they were playing.
Using this opportunity, Robin took a permanent marker and drew a star on uncle Dick's cheek
And went on patrol, star still drawn on his cheek
Obviously that show-off got caught on cameras and some showed that Nightwing had a little cheek star drawn on him
Robin saw videos of Nightwing with the exact same star on his cheek like she drew on uncle Dick nd marched up to him
"You are Nightwing, because I drew a star on your cheek and Nightwing had the same star on his cheek last night."
Not sure what else would be going on after that, except the others denying that they have anything to do with the other vigilantes ( because they're all very aware of Robin's hero obsession and also know that Voids would never allow her child to go out and fight crime )
So Robin probably ends up mostly bothering Dick to teach her how to do some of the crazy ass stunts he sometimes pulls, and best all of them at once, while Dick tries to *not* teach her cause that would be the first step in a direction Voids does not want Robin to go