I forgot about the Cheshire conversation.
My theory was somewhat based on thoughts that if SB does indeed go rogue, a tactical maneuver could be to have a superpowered hero onhand pretending to be an unpowered one. Of course, I contradicted this by talking about the gauntlet and sandals. :P Superboy would see her as no threat and probably engage the more powerful teammates Miss Martian and Aqualad first.
Another reason for my theory was just based on the name... why 'Artemis' for someone not based in the WW mythos? Arrowette or Speedy (with Roy taking a different name, as questioned earlier in the thread) would've been a viable choice for Green Arrow's 'niece.' Just seems odd to me.
I could just be reading too much into it, though. Just wanted to throw my theory out there.