Yvonne Craig was Batgirl on the 60s Batman television series, known for being extremely campy and silly. You may know it from the onomatopoeias that would blast on the screen whenever Batman punched or kicked. Whack! Bam! Boom! Yvonne Craig was a ballet dancer and actress, which helped her be a nimble crime fighter. In the show, Batgirl is the alter ego of a librarian/police chief's daughter. This is roughly her backstory in other iterations of the character as well.
Unfortunately, the show only lasted a year after she became a part of it. Batgirl wasn't her only role though. She also starred in movies like Gidget, It Happened at the World's Fair, and Kissing Cousins. She is out of the acting game now. No, she's not a librarian. She is a real estate broker.