Re: DC's New 52: Reviews and Discussion (Spoilers welcolme and likely)
Barbara is relearning how to be Batgirl again. That's the point of the arc. Also Babs has never been a menacing creature of the night...as Santa Kang stated Babs has no interest in Bruce's gimmick. She is and always has been her own persona and way of fighting crime. Cassandra Cain is more in the mold of what you're referring to as a creature of the night. Silent and deadly. Babs is the opposite, she's very much like Nightwing...in your face and gets the job done while trying to have a little bit of fun.
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Ignoring the The Last Stand since 2011.