I've read through the messages up to here and one (of many) questions comes to mind if anyone knows the answers to.
Where the car was found is stated as near the base entrance. Was it within walking distance to anything? Where I'm going is Bad thing happened in the park and bad guy drove car back to civilization. Walk back on base? Or maybe mass transportation stop within walking distance from where car was left?
She was 5'2". Was the driver's seat rammed forward? (Take it from a guy that is married to a 5'2 girl) It'll be moved up if she's driving last. Being pregnant would mean the seat may be leaned back but I'd bet it was scooted forward to reach the pedals.
If the car left in the dirt/sand, any tracks from the driver's side of the person leaving the car. Military boots vs girls flip flops or tennis shoes.
Though lurking for a few years, this is my first post. Has a timeline been drawn up yet?