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She plays tricks on them because they were mean to her when she wasn't popular

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14y ago

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Because Courtney (Alison's twin sister) had a book of all of their secrets and plus Alison didn not like the girls at all. And the real Alison made Mona do it.

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13y ago
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Q: Why did Alison and Mona blackmail the girls in Pretty Little Liars?
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