Okay, throwing another new theory out there (bear with me, my job has been slow this month, too much free time to think):
What if MVJD was not a street kid, prostitute, etc. who was killed by a stranger? What if she was someone's girlfriend or wife and was killed by her boyfriend/husband? Here are the reasons why I'm coming at this from a new angle:
-Autopsy showed signs of recent sexual activity but not consistent with rape (which isn't to say that a woman's partner can't rape her, but if a stranger grabbed her off the street, he'd probably not be very gentle)
-She had false nails, implying she had time and money to care about her appearance
-She had only broccoli as her stomach contents, implying she may have been dieting to keep herself in shape
-She had a shaved pubic area (maybe she maintained it for her bf/husband) but her underarms had 2 weeks worth of hair growth - it was winter, and personally, I might not shave under my arms every day in winter since I'm not wearing tank tops, but certainly maintain my legs and pubic area for my partner)
-She was posed with her arms outstretched and legs crossed at the ankles which I'm imagining is a Christ-like pose. She was therefore placed carefully, not shoved out of a car or dropped in the woods somewhere. They wanted her to be found.