If Gretchen was my close friend and told me about her problems at home I would have a hard time dealing with it personally because it breaks my heart. The first thing I would ask her is if she has told somebody and if she hasn't she needs to. I mean the only way that it can get solved is if somebody knows, granted I know her older sister brought it up and it ended badly, but there is a huge possibility that it is still on file. Plus maybe they can have someone just watch from outside the house until they get the evidence they need if they don't have it already.