I think I was one of only a handful of people who figured out who she was, DC Comics speedster, Jesse Quick. This is her uniform from the
"Young Justice" cartoon show possibly the Teen Titans (comic or animated show, dunno which).
Cosplayer: It's Raining Neon
UPDATE: DeAnna was featured in Uproxx's Funny, Sexy, And Awesome Cosplay of the Week (03.21.14). Yay!!! :-D