Thanks for the links, dragonfire!
Happy 80th birthday to the Batman!
I hope you feel better, sum1.
Supergirl was one of the casualties of the Crisis On Infinite Earths back in the 1980s, Rita. Barry Allen(The Flash) was also one of the casualties, and Wally West(the original one) took over as The Flash and was the only character with any memory of the previous timeline. Crisis was DC's way of cleaning house back in the 80s when they were trying to simplify their continuity by eliminating their multiple universes and combining their elements into one timeline, and also make their universe more grounded in reality to better compete with Marvel, who by the 1980s had surpassed them in comic book sales for the first time.