Why She's Guilty: Of all the main members of the gang, Emily has definitely fared the worst. She dropped out of college, she's scrambling for cash — even donating her eggs for extra money — and she's mourning the loss of her father. Under that kind of pressure, there's no telling what she might do.
Why She's Innocent: Emily's dealing with so many personal issues, it seems entirely unlikely that she'd have time to terrorize her friends. Plus, she'd kind of need money to do all of the things this new villain does. Finally, there's something telling about her utter unwillingness to help the girls in their mischief.