The SHE -A

Hello Little Liars. 
The SHE -A theory...

We've been always wondering whether Alison is really dead or not, whether she has a twin or not, whether she is the main -A or not. 
There are many reasons why we think Alison might not be dead.
1) -A knows secrets about the liars that only Ali knew.
2) We never knew who murdered her, why nor how.
3) We've seen once how a creepy hand got out of Ali's grave at the end of one episode (picture is showed below)

About the twin theory. There are many things that made us believe that Alison had a twin: 
1) The Halloween story about two twins Ali narrated. (In which one girl stabbed the other)
2) The books (even though they are very diffrent from the tv show there are some similarities).
3) In one of the halloweens episodes we get to see an Alison's flashback. the flashbacks is in Ali’s room, she is lying on the bed when Jason comes in and on the wall behind her you can see a picture frame and a plaque. The frame shows 3 pictures which appear to be Ali, Jason and Ali again? This could be Courtney.

The plaque below, says ”C’est le double de rires et de double le sourire, et double la peine si vous êtes bénis avec des jumeaux.” which is french and translates to “It’s double the giggles and double the grins, and double the trouble if you’re blessed with twins.”

 

 

But those are NOT the clues that make me believe Ali / Courtney is the main -A. What really brings this thought to mind is the sneak peek we saw in which Mona and Toby are talking about what they will do as A. In this sneak peek Mona tells Toby "They need to understand she is in charge". This impressed me, is she referring to the big A? Is she saying that the big A is a woman?
If Mona is "telling us" that -A is a woman that makes me think it is very possible that Ali (or her twin sister) is A.

Here you can see the sneak peek I'm talking about and you can make your own theories.