::shrug:: Regardless of what costume she's wearing and what they call her, it's Karla Sofen. If you are interested in her and enjoy Reed's writing, there's no reason not to pick it up.
I don't have the old Thunderbolt issues, but she's always been portrayed as someone deeply damaged, with a hope for love, but who is so distrustful that she relentlessly tries to manipulate everyone she can--usually sadistically--but she's always been fairly clearsighted.