Can someone help me explain what happened in last night's Pretty little liars

episode? So when aria, emily, hanna and spencer went to see ally's memorial thing. Spencer saw someone with a last name of cavanaugh. (I think that's how you spell it), I'm wondering was that Toby's mom? Or was that Toby's grave thing?? Because she wrote Toby on it with the "a" key.. so I was confused. also do you think when emily was at the grave do you think that was alison being "a" or also in the red coat? I was confused by that part.. but i heard she has a twin or something named Courtney.. but I'm not sure if that's true. Can someone help me explain this episode?? thnxs
 
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