(Disclaimer: I do not DC. REALLY wish I did.)
Before Barbara Gordon left Gotham, she had always fought with the boy wonder, Robin. But she had to be around him if she was to be Batman's sidekick. Then she moved to Metropolis, and made actual hero friends, not just heroes who were her allies. But her dad received a job offer back in the Gotham City PD again. So, Babs uprooted her life yet again. Eventually, Jim got invited to a Gala and brought his daughter with him. There, she met Dick Grayson, her future best friend.
(I based this on DC Superhero Girls if it wasn't obvious)