I think that CeCe killed Mona because
just like Alison she proably didnt like Mona or Alison convinced her to do it. Alison could had watch CeCe kill Mona thats why there was two different hairstyles. Cause it couldnt be Alison cause its to obvious.
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Pretty Little Liars Theories
RandomThis story will be talking about what I think is weird on Pretty Little Liars and some Theories and thoughts that you might had never thought of and i hope u enjoy.