Multiversity Harley Screws Up the DCU #2

Plot

Harley's come face-to-face with the most unexpected ally--herself! But just who is this strange Quinn copy, and what the heck is she doing on this strange alternate Earth devoid of heroes and overrun by Starro'd versions of all of Harley's best friends? (Here's a hint: it has something to do with Harley screwing up the DCU.)