I am going to guess her body is close by --- knowing how that area, and all of NJ, has a much higher proportion of LE than many states. This is one of the reasons NJ has the highest property taxes in the country. Because every town, even if it is only one square mile as are some, has its own police dept. Go out onto the Garden State Parkway (to get to the Pine barrens) and it's loaded with State Troopers. My beach town had 2500 families and 15 LE. And if you're driving around at 1, 2 or 3 in the morning at the jersey shore, you have a good chance of being pulled over...just because.
Point being a NJ resident murderer would not take the chance of driving around for any significant time or distance with a dead body in their car knowing the volume of LE everywhere. IMO.
Ps. I love NJ LE. My post is factual, but not judgmental. Most towns also have their own elementary schools, fire depart, post office, library, etc.