Sounds good to me.Okay, this: After the Silver Age "Prisoners of 3 Worlds" Bette was not recovering from the hallucinogenic gases the aliens used on the Batfamily. Batman consulted with Superman who had them all meet him at the Fortress of Solitude.
They ended up going to Kandor, since there was an expert about this alien race/elements who could help.
An injection or treatment was given, which seemed to purge the remaining toxic gases from her system.
Bette was the youngest of the four, so maybe more of an impact?
Superman told Robin and "Bat-girl" the story of Nightwing and Flamebird, while in Kandor.
Before they left, Batman or Batwoman suggested Superman use Super-Hypnotism to make Bette forget - - almost everything.
But years later (the Teen Titans stories) it had come back to her and so she returned.
Powers: something suble some enhancements of her natural abilities and maybe a small version of phoenix abilities; the coming back from near deaths that eventually happend.
We could go garish and say an affinity to flame, heck, why not?