Bouncing Betty seems like the obvious choice
Unfortunately, it's been done:
http://www.comicvine.com/bouncing-betty/29-66242/"Betty towers over her teammates however (Verre, Thug, and Burst) and also stands out in particular because of her height, and also her very prominent
blonde pigtails"
As for the OP, I think I'll second
Flexica. If you want to get silly then you can give her the civilian name of Polly Eshter.