The grandparents make some serious money, and are most likely just refusing to hire AB an attorney. They always had the "You did it, you deal with it" mentality (IMO). As far as I know, there is no apparent motive, and (again jmo) there most likely isn't one. The grandparents were not only helpful, but from what they have said they allowed LE free use of their property, and allowed them to search their house several times without warrants. A person that lives in the house told me that he offered them coffee/soda/hot chocolate and umbrella's while it was raining. AB acted normal afterwards (as I've been made to understand), and from what I hear all the other children in the house offered to help search for elizabeth. As to why she went to church before school I assume its for the same reason as everyone else that did it, to grow closer to god.
Sorry If I'm being vague, but I was told what I know in confidence, and the things I was asked not to repeat I will not repeat.