You know what i don't understand: Why was 4x24 all about figuring out who A was when they already knew that the person who send the texts to Alison before she dissapeared was Mona? Why was Alison like: 'A had been threatening me since that Halloween' didn't she already know that that was Mona? Did she thought that it was someone else? It can't be Charlotte because she didn't even know about the A game at that point..
Ali definitely knew someone stole the game from Mona and she was scared of who that could be. Ali asked for CeCe’s help in Ravenswood (big mistake!) to divert A’s attention from the girls so she knew someone took over from where Mona left off and I think her comment about someone attacking her from Halloween still holds true because she assumes Mona must’ve played a role in the transition of leaders.