No one broke into the house but did everyone leave the house unlocked or locked? If JO arrived Monday morning at 10 AM, and no one answered the door (even with car in driveway) and it was locked, she might assume they intended to come back. If it was unlocked and she walked in, called out and went looking in the house, she should have noticed the house in disarray from when she left it 12 hours earlier and noticed blood or something. She might have then thought of phoning around the family and maybe hospitals or whatever thinking primarily of her son. It wasn't until 4 pm I believe that the Amber Alert was issued saying NO could be with AL.