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Because Alison has a mentally unstable twin identical sister named Courtney who was pretending to be Ali. Courtney-as-Ali ruined Ali's life, she ditched Naomi and Riley (Ali's bff) and befriend with Aria, Hanna, Spencer and Emily. Meanwhile, the real Alison (who was pretending to be Courtney) had to stay in mental institution because Courtney has mental issues. Alison got tired of it and killed Courtney. She tried to kill the Liars because they had also ruined her life. She didn't want them to be her friends she wanted her old ones.
What else can I help you with?
Where was Alison in the movie Pretty Little Liars?
Allison was running from everyone in Pretty Little Liars because A was after her and she didn't know who to trust. The story that the cops know, is that she was kidnapped.
Is Cece Alison in Pretty Little Liars?
No. A friend of Alison's.
Did the pretty little liars kill alison?
No.
Did Alison get discovered in Pretty Little Liars?
Yes, Allison got discovered in Pretty Little Liars
Does Alison have a boyfriend in Pretty Little Liars?
Alison dated Ian.
Who did Emily really seen the night of the fire in Pretty Little Liars?
They saw alison who everyone thought was Courtney.
Who's the killer in Pretty Little Liars?
Alison....
Is Alison in Pretty Little Liars dead?
noNo.
Who is the second 'A' in the 'Pretty Little Liars Wicked?
Alison
Does Alison on Pretty Little Liars hate Emily?
NO!
Who killed Toby in Pretty Little Liars?
Alison.
Who is red coat from Pretty Little Liars?
Alison
