It's later here, and this may be a stupid idea, but does anyone think it's possible that someone broke into the house while the family was at the game, pried the screen for easier access back in later, and moved the shade so that they could see in to tell when Isa was put to bed? THen they could have just let themselves back out, however they got in, and waited, peeking through the window until she was in bed and gone back in.
I know the dogs make this unlikely, but the dog I had before this one was so intimidated by the guys that robbed us blind that the only sign he left that anyone had been in the house were the huge piles of poop spread throughout the house. The robbers really scared him. If they hadn't taken anything, we would have just thought he was a really bad dog while we were gone. It wouldn't have been too hard for one of the neighbors to figure out their schedule, I guess it wouldn't have been too hard for anyone...if they saw the whole family leaving, and at least one of them was wearing a sports uniform, that seems like a pretty safe bet that the house will be empty of people for the next couple hours.