Mother Panic, by Jody Houser and Tommy Lee Edwards, is about a new character who fights criminals as a high-tech masked vigilante in Gotham City. She wears a cape and a helmet with pointed ears, but her outfit is white, and she's clearly unaffiliated with Batman and his allies. In fact, when the premise was initially revealed, nobody was really sure if this was the Gotham of DC's Batman books, or a whole different take on that world.
However, it's been set-up since the first issue that the Bat-Family have become aware of Mother Panic's activities. And in this third issue, she and Batwoman come face to face, leading to a fight and some weird angry flirting.