Just curious

I heard they are planning a batgirl movie. This wasn't the first time I heard she would join the dc movie's. She would also join Harley Quinn and poison ivy also catwoman. I was looking thru some comic pages on Google. This one girl had a crossbow. I was trying to think who the huntress was. I seen a clip from arrow. Now I knew who she was. Her husband I believe died and she went after her father business if I remember right. I also seen the black canary. I knew her from arrow also. I didn't really know all about these side stories in the comics. One person I am curious about is batwoman. Who is she