What references to Scratch are you seeing in AA's username, exactly? Yeah she's watching Ly'lac on a viewing orb, but that was something Rose did, and it appears to be something all nymphs do as a result - Ly'lac herself has both an Orb app on her computer and an orb lying on her bedroom floor. We already know that nymphs measure time in relatively short increments, so it's pretty clear the joke here is that AA is playing up how much older she is as part of the wisened mentor & young apprentice bit. Definitely jumping the gun a bit to compare any weirdness on her part to Scratch-level weirdness and just not general homestuck troll weirdness...