well i havent read the 图书 so dont tell me if im right but i dont think that Ali is dead but i also dont think that she is A either. I think that Mona is A... it just fits her personality, i know now everyone is going to ask me how she gout the info on alll the secerats if only Ali knew them... well all of Ali's stuff was put in boxes so if Ali wrote them down somewere she could have gotten them there.Thats just what i think i hope that 你 like my thoughts?
i haven't read the books, so don't blame me if i'm wrong. I like a good ghost story so i like to belive that Ali is doing it, even if shes dead. Although i also belive A can stand for just Anyonomus, and be a stanger/stalker person who knows their secrets. But I 更多 of think that its Ali because they reiasive texts right after something happens and theres no one really around, so i would think who else could know that besides a ghost watching them. But thats just my opinion, hope it helps ^.^