I'll be honest here: she's more on the Light than on the Shadows. She's not a villain, just an anti-hero. I mean, her crimes are mostly robberly and cat-buglary. While still a crime, that's far better than murder, extorsion or arson. Beside, she has been helping Batman a few times.
Totally agree. Lots of people still view her as a villain, but she's incredibly righteous. Actually, if I obtained superpowers or cat-level reflexes, I'd probably do exactly what she does--one of the reasons I love her so much!