You were the daughter of Bruce Wayne, you have really cool powers and soon guy Gardner found out about them. He came to the Wayne manor trying to get you to join and with some persuasion and being nice he convinced Bruce to let you join.

You were now apart of the ‘justice gang’ but only guy liked the name. He walked you in and you got a wave from Mr terrific, a ‘hey!’ From hawk girl, and a warm welcome from Superman who patted you on the shoulder and gave you a tour.

Guy\ green lantern was your mentor now, he helped you train, raised you, and basically became your second dad.