Earring Theory (Spoilers)
Well I was sitting here having a thought and I thought I would post here. I haven't read many previous posts so I don't know if this has been brought up BUT...
What if the earring Aria and Allison found in Aria's dads office was actually Allison's? It would explain why Alli wanted to trash the place and Meredith had no idea where the earring came from. It would also explain the heated discussion Garrett saw Allison and Aria's dad have the night she went missing... So maybe Aria's dad and Alison were having an affair? It would seem why she was so intent on having Aria tell her mom... Remember why she was pushing Spencer to tell Melissa about Ian so badly?!
Anyways would love to hear your thoughts!
That's actually exactly what I was thinking.