It is not really alison, but it is her twin sister who was home from the mental hospital and she sent alison back. Courtney Dilaurentis gets in a fight with spencer and is killed by A. If you read the books it will all make sense.
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Basically all Ian did was have a little Affair with Allison and then married Melissa, spencers sister. He was with Courtney, allisons mentally insane sister pretending to be Allison the night she died
Mona and Alison.
Because the Pretty Little Liars weren't actually her friends. Courtney, (Alison's twin sister) made friends with them. Alison had nothing to do with them. So she's mad and tries to kill them.
I'm now to sure what you mean? but i LOVE PRETTY LITTLE LIARS in the book alison hates them she was forced to become there friends.
no