You have to rewatch this scene from 'She's Come Undone' right now! Is this a clue?
Did you see that? 'A.D. Incorporated'!!!! We TOTALLY forgot that we'd seen A.D. written down long before the later seasons of PLL. The big question is: does this mean anything? It could just be Ali's initials (that is who Emily is posting money to after all) -- could that mean that Alison is A.D.? Or perhaps it's Charlotte who, at this point in the show, is actually helping Alison. Yes, we know that Charlotte is now dead, but you know what A.D. could also stand for? 'After Death'! Are we reading way too much into this?
Well, what about Paige?
Doesn't this scene remind you a LOT of the argument Paige and Emily had in the 7A finale? Paige was furious that Alison was coming between them, which is sort of what's happening in the scene above. Could Paige have decided to use a name related to the first time it looked like Alison might jeopardize her and Emily's relationship? That doesn't seem THAT crazy, does it?