I'm not sure but looking at episode 14 season three it shows that Mona knew and happened to tell Emily... so I'm thinking we both missed an episode!
it was her stalker
She's not dead.
Ian gets killed by "A" but later his body disappears
Yes because A killed him
she knows who killed ali and that her boyfriend is still alvive
"A" killed him
A
No
The real Ali killed her twin Courtney. Courtney was friends with the Pretty Little Liars. Ali didn't like Courtney.
Ali killed Ali!
Alison.
He wasn't.
it was her stalker
'A' in Pretty Little Liars is alive at the moment in the show but later gets killed by Spencer.
because she is A.
alison did
Ali killed her.