But, remember, how much past "experience" does she have in the current stories? She was Batgirl for a VERY brief time (maybe a year; probably less than two years) in the New52 prior to being shot by the Joker; hadn't she already curtailed her Batgirl-outings even before she was shot?
Then she was incapacitated for a few years prior to her resuming the Batgirl costumed identity.
How much of her previous pre-TKJ Batgirl time (if any?) has been added back because of Rebirth?