She happens to know most their secrets because of Jenna.
She has Ali's old diary from when she died and knows all of their secrets!
Because the used to pick on her, (The Pretty Little Liars)
mona is the first A
Mona
Toby
Monda knows secrets about the girls in Pretty Little Liars from cameras and rumors.
No, Mona wasn't the killer in Pretty Little Liars
Mona is A. Mona was upset that Hanna had all these secrets that she never directly told her.
Mona is "A" because Hanna found new friends. Mona found "Alisons" diary of secrets about the girls that "Alison"kept! Mona is "A"! -Ellie
She has Ali's old diary from when she died and knows all of their secrets!
actress Janel Parrish is portraying Mona on Pretty Little Liars
same way mona did.she looked at courtneys diary which had all there secrets in there.
At one point, Mona was A on Pretty Little Liars. Now she is helping the girls figure out who A really was. She was A because she couldn't get tortured, if she was apart of them.
Mona found Courtney's diary after she died. That's how she knew all the secrets.
Mona crashed into Hannah in Pretty Little Liars.
No. Jenna Marshall is blind on Pretty Little Liars
Janel Parrish played Mona in Pretty Little Liars