She looks at you like you just asked the stupidest question on Earth.

"DUH. I'm Batgirl! Like you and Cass! I bought some new stuff at a thrift shop near my place, personalized it a bit. I know I gave it a shot before, but I figured, hey. There are two Batgirls running around now. Why not three?"

She folds her cape dramatically over her face, not unlike a certain billionaire you know.

"They've been calling me... The Bat-Girl of Burnside."