25 years ago - Karen Beecher is born.
8 years ago - An accident with Ray Palmer's white dwarf star activates 17-year-old Karen's metagene, & she begins fighting crime as Bumblebee.
6 years ago - 19-year-old Karen joins Flamebird's Titans, and is injured in Quarac, Disrupting her control over her powers. She is saved by the Doom Patrol, who stabilize her powers so she can join them.
Bumblebee's origin is pretty ignominious. The girlfriend of sort-of teen titan Mal Duncan, she created a supersuit and attacked the team just so he could beat her and look good, and then quickly retired, the team none the wiser. Later when she confessed, the titans decided that she had been so awesome, she should join them as well.
With the introduction of Marv Wolfman and George Perez's groundbreaking New Teen Titans, Mal & Karen were left out of the new lineup. She would be a regular background character for years until she was made a member of the Doom Patrol.
Perhaps the most interesting thing about her is just how directly she mirrors Marvel's Wasp. Not just in her costume and powers, but in the way she was used specifically as a foil to make Mal look good to the Titans, an almost deliberate reflection of Hank Pym's attempts to build a villain he could defeat to look good to the Avengers, inadvertently creating Ultron. Interestingly, Hank Pym is Marvel's closest allegory to DC's Atom, the character we've maneuvered to become Karen's original mentor. Her powers make more sense when they're originally rooted in Ray's White Dwarf energy, and the symmetry in making DC's versions of the Wasp and Ant-Man work together makes too much sense not to use.
Of course, we've added her to Flamebird's Titans, a team which is wiped out during the Quarac bombing. This ties in very nicely to her later career with the Doom Patrol, giving her a reason to join that team where she can be a key part of the group eventually led by Beast Boy.
Karen in the comics is often defined by her relationship to Mal Duncan, but we've killed that character after the bombing of Quarac. Karen, on the other hand, gets to go on having an illustrious career. She's often a featured character among the women of DC, and she deserves more of the spotlight.