Above is the mysterious first appearance of the Hooded Girl from Flashpoint #5 who is talking about the merging of three worlds; which I believe are meant to be DC, Vertigo, and Wildstorm.
Her first appearance in the "New Rejiggered 52" is in the stands of the football game. This book is set in the past which not only makes the Hooded Girl's appearances span great distances, but also time.
Here she is in the crowd at the hospital in Animal Man #1 after we see Animal Man's eyes bleeding.
This one was tricky to find in Batgirl #1. It is at the end as the villain shoves the guy out of the hospital window.
She appears standing in a crowd of onlookers half way through Detective Comics #1
In Green Arrow #1 the Hooded Girl seems to be playing peek-a-boo with the readers instead of being in the background just watching.
The Hooded Girl pops up at the end of Hawk & Dove #1 to watch a group of guys get attack by a zombie thing.
Peek-a-boo again in Justice League International #1 about half way through the book.
Stormwatch #1 has the Hooded Girl watching Apollo escape.
In Swamp Thing #1 she pops in to watch Alec Holland talk with his buddy at a construction site early on in the title.
Here are the Hooded Girl's appearances in the titles I didn't pick up this week:
(image from www.bleeding cool.com)