Not every appearance of Power Girl is worth a full write up, here are all the single panel appearances of Kara until Crisis.
Secret Society of Super-Villains Vol 1 12 (Janurary 1978)
The Plunder Plan!
Green Lantern Vol 2 110 (November 1978)
The Doom of Dragon-Fire
Secret Society of Super-Villains Vol 1 15
The Wizard’s War of the Worlds
DC Comics Presents Vol 1 38 (October 1981)
Whatever Happened to…the Crimson Avenger?
Wonder Woman Vol 1 285 (November 1981)
The Man in the Murder Ward!
Wonder Woman Vol 1 300 (Februray 1983)
Beautiful Dreamer, Death Unto thee!
America vs. the Justice Society Vol 1 1 (Janurary 1985)
I Accuse
America vs. the Justice Society Vol 1 4 (April 1985)
D-Day for Degaton
We also get several pages of her testifying on behalf of the JSA, but it’s mostly recaps of old All-Star stories.
DC Comics Presents Vol 1 72 (August 1985)
Madness In A Dark Dimension!
Infinity Inc. Annual Vol 1 (December 1985)
Green Dreams & Precious Illusions
Legends of the DC Universe: Crisis on Infinite Earths (Feburary 1999)
Convergence 0 (June 2015)
The God Machine
(Considering the scene it’s Post-Crisis, but for ease, we’ll keep it all here)
Convergence 1 (June 2015)
Domesday
Convergence: World’s Finest Comics Vol 1 1 (July 2015)
The Seven Soldiers of Victory
