Back to my theory about Abby, not only do I think she did it to drive Jess away from her family but I also tend to think that maybe she told her mom or Christy found out some way..., therefore Christy knew and wanted to protect her daughter from getting caught so she has felt guilty knowing that Abby is the killer... wants to protect her daughter... but also knows Ben didn't do it, thus paying for his lawyer.
I need to stop drinking.