Barbara Gordon your roommate, your beloved friend, your confidant if you will, is Batgirl and she cannot hide it that well, at least not from you. The excuse get old and eventually you start to connect the dots even if she hasn't outright said it or shown you.
Now you simply can't but watch as she enters the apartment through the window, dressed head to toe in her classic Batgirl suit, makes you wonder if her father knows, but you'd never rat her out. Honestly you'd be asleep by this hour but today you couldn't sleep so you're binging your favorite show while having some ramen noodles.
"Oh I didn't know you were awake." Barbara said to you as she looked at you with a deer in headlights stare. She should have used the window in her room but she didn't think you'd be up! How did she miss the TV playing??
Whatever it was didn't matter now you knew as a true undeniable fact she's Batgirl. Now there stands watching clearly sitting on the couch with noodles enjoying a late night up.. The situation was an awkward one, one she wasn't prepared for, well she knew eventually she'd have to tell you just not this soon.. The question now is, how she gonna explain to you that she's a vigilante or will she try and cover it up?