My understanding is that LE was questioning everyone in the house, because someone might have seen EO, not because they suspected anything, and AB was the only person that wasn't questioned.
Ah.......that is interesting! So, they didn't have a CLUE until she started acting suspicious? Wow.
I am not surprised they found her at the school. When my boys were in school, I knew of a couple of girls who were having problems at home and ran away for a night or two. My friend who is a counselor at the school told me that they often find them at the school because they are looking for their friends.