I have a theory, but this ones not of hanna having a twin, its about hanna having a personality disorder, remember in 2x25 when Hanna was driving and when she got to mona and spencer, hanna wasnt stopping, she almost ran mona over if it werent for aria telling her to stop, ik she was pissed cuz her best friend was torturing her and tried to kill her, but, would she really run her over? she was REALLY angry
hanna angry
what IF in this scene hannas other personality started to kick in? what IF Mona being A TRIGGERED her personality disorder( idk if this is possible cuz idk much about MPD, im just speculating), and lets not forget, Marlene tweeted that Big A stole the game from Mona in season 3, and this scene happened in the season 2 FINALE, right BEFORE season 3 started and Big A showed up AND we also know that A went to visit Mona at radley to steal the game from her, and who was visiting Mona for weeks at radley? HANNA