Malone’s role was unnamed and mysterious until BvS arrived in theaters, so the fandom spent months debating who the Sucker Punch actress might be playing.
Zack Snyder’s comments (via Twitter) come from his recent screening of Batman v Superman’s director’s cut.
A Q&A accompanied the screening, and the director/writer was finally able to address those rumors about Jena Malone playing Batgirl.
With so many characters being introduced in the blockbuster, it didn’t seem out of question that Barbara Gordon might be incorporated.