her civilian name might be Betsy Bechdel
Then her hero name HAS to be Besty. And THAT is her super power, AND her catch phrase - "Besty is The BEST!!!"
18 DEX & 18 INT, a TON of skills, decent CV, Martial Arts, a few gadgets (Flash Defense Sight Group, Life Support Extended Breathing, Radio Send & Receive), a multipower with various powers & attacks (Flash, Entangle, NND, APED, AOE EB, AOE Flash, AOE Entangle, AOE NND, Swinging, Gliding, AOE Darkness "Smoke Bomb", that should do it), and finally Four Over All Levels!
In combat the Over All Levels will give her +2 to OCV & +2 to DCV, which will make her REALLY formidable. I'd say ratchet her DCs down by 2-3 so she doesn't overshadow the other charters, because with Martial Arts and those skill levels she will NEVER get hit. Also, the FYB powers in the multipower will give her plenty of opportunity to debuff bad guys, but let Star Girl be the one to ACTUALLY finish them off.
After all, "Star Girl is the Star. But Besty is the BEST!"
And +4 to any skill roll or Perception check will make her really formidable when she's out of combat. She'll be the Velma to Star Girl's Daphne.