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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.
Allison is still alive. But she is not A, Jenna is.

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2017-10-27 10:55:21
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Q: Why does Alison become A in Pretty Little Liars?
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