[quote=@Prince of Seraphs] I doubt you intend to answer that question nor does it need answering so what's the point in making it a problem in the first place?
[/quote]

You're the only person who regards it as a problem. The Dee Dees are career criminals, and as with most career criminals unlikely to ever completely leave that life behind. Second, if you desperately need a reason the granddaughters of [i]the[/i] Harley Quinn haven't moved up in the ranks, they're incompetent fuck ups incapable of doing anything right unless being guided by someone else with the power, tech, or intellect to back them up. Besides that, who says they haven't moved up? We don't know that; we only know they're on a boat with other hooligans causing trouble. Third, nothing I read indicates they're still teenagers, so that's moot (and I'm not sure why it ever was brought up to begin with). Fourth, and perhaps most important of all, we were informed right out of the gates that this game was loosely working with three separate continuities as inspiration, and anything can be altered to accommodate our setting and circumstances. 

Please take your own advice, and don't make things a problem when they don't need to be. And arguing with a GM is poor form.