Batgirl supposed she really should stop sneaking up on Stephanie. One of these days she was going to give her best friend a heart attack. On the other hand, her friend really should develop awareness of her surroundings even while spying on someone. Batgirl just hoped that awareness would be learned in her lifetime. Or more accurately, Stephanie's.
Once the boys were aware of their presence, Batgirl joined Robin on their roof, but she didn't even need a grapple line. It wasn't too far for parkour.
Doug introduced her to Spider-Man as his girlfriend. She decided he could get the hang of being thought of that way. But even so... "Not scary," she asserted.
To Spider-Man, she held out a hand for him to shake, hoping that was the correct custom for costumed types. "You're his friend?" She indicated Doug. "He needs friends."