when Allison's stuff is put out for free, mona takes Ali's diary
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!
Actually, he didn't. He isn't even then A person, or the murderer. They were friends with Courtney, Allison's twin, and Ali being mad that Courtney stole her life, pushed Courtney in the whole. Mona, and Ali being friends, Mona was old A, when Mona died, Allison took the job for herself, getting her sisters diary to get the girls secrets! She framed Billy.
Mona follows Hanna, Aria, Spencer and Emily so she can find on secrets from there current lives. Ali's diary only has there secrets from when Ali was writing it which was three years before texts from A start coming in...
jason, lucas, mona and toby are in the A team. Mona is the head of them all, and she is black mailing lucas into helping her. I think that jason likes mona and that is why he is helping her, and i think that mona has something on Toby or he has had enough of being left out by spencer and emily but them not telling him about A and all of their secrets.
She happens to know most their secrets because of Jenna.
When Maya takes all of alis trash out to the curb, Mona takes Ali's diary from it. All of the girls secrets were in there.
Monda knows secrets about the girls in Pretty Little Liars from cameras and rumors.
when Maya was cleaning out the house she put Alison's boxes outside so Mona gets her stuff like Alison's diary and reads the girls secrets and Alison's from then she texts them and follows them
In Pretty Little Liars, Mona was able to uncover all the secrets of the main characters through her observations, manipulations, and tracking their movements. She was highly intelligent and used her resources to gather information and exploit the vulnerabilities of the liars. Additionally, Mona had a knack for decoding clues and piecing together the puzzle of their secrets.
She has Ali's old diary from when she died and knows all of their secrets!
Mona is "A" because Hanna found new friends. Mona found "Alisons" diary of secrets about the girls that "Alison"kept! Mona is "A"! -Ellie
Mona is A. Mona was upset that Hanna had all these secrets that she never directly told her.
When Ali's stuff was being thrown away, Mona took Ali's diary, read it, bought a second phone, became a stalker, and Viola!
they had many secrets like one was that they had blinded a girl. i read the book and a was Mona but they didn't tell who killed Ali they just said that she had "FAMILY ISSUES"
she got a hold of ali`s(courtnys) dairy where Maya moved in to alis old house and threw out all of alis stuff out. Mona found it and read it, ali(courtny) keep a dairy on everthing they did and she put all her secrets in it and not only about her but of Spencer Hannah Emily and aria
When Maya was moving Alison's things out of the bedroom she left everything outside on the curb, so when Emily and Maya went inside Mona was able to grab Ali's (Courtney's) diary.