In terms of "significant to the plot"? Offhand, the Superman ish where she helps Clark fight Kyr-whatserface, probably, that was middle of last year or so IIRC. She was important to that whole stupid Supertorso arc and had that issue Kara's title where she punched her in the face. She had that bit in A-NA where she took down Giganta and invited Ryan Choi to join the JLA. There was the whole Manhunter arc. She was in B&tB with Peej. That's the more recent stuff, but if you go back they're still relatively frequent - she was one of the heroes Kyle learned from in his Mentored-by-Everybody arc, she's been in and out of Action probably more than anyone else who isn't actually Super supporting cast (possibly even Batman, though don't hold me to that). If you just want "panels where she shows up and does something relevant" she was in S/B just last week, where she knocks Bruce into the moon and gets talked up a bit as the most relevant member of the opposition. I mean, yeah, you can count that as "showing up as part of the JLA," but how many of, say, Wally's cross-universe cameos are going to fall under that heading too?