I would hazzard narcotics involved. People committing desperate crimes usually are strung out. You see some crimes where a gas station is robbed of $50 and then 2 miles down road a 7-11 robbed for $28 and right away i think drug user. This is a crimminal desperate for cash. Imho will be determined drug related.
Very very lucky young girl found alive. As time drags on, the liklihood of that happening decreases greatly.