It would seem to me that someone wanting to molest her would want to take her to a place where they would be less likely to be interrupted. If the motor home was unlocked, etc, it would be the perfect place to carry out the act. This brings up questions as to guests comings and goings during the night. Anybody there that evening that wasn't there in the morning?
Other questions as to body placement, seems to me, most likely she was kept alive until later, killed and disposed of. I've been around dead bodies in various stages of decay, and after a few days they really start to stink. Freezers, etc, should leave some signs on the body, as the freezing of water in the cells should make cell walls burst, at least on living people. Don't know enough about forensics to be sure what effect on dead would be. Plastic bag would not stop decay, dittos for paper bags. It doesn't make any sense to me that someone would dump her in a bag, then come back later and remove bag.
I'm not saying it's impossible that various things were done to hide decay and she was dumped later, but it just seems more likely that someone would have kept her locked up (this also makes sense in that it would allow continued abuse or making of movies) and then killed her when they were done with her and dumped her. Since several of the people at the VD's were known to have pretty unusual sexual lifestyles, the possibility of her being kidnapped for use in child porn doesn't seem too far out of bounds to me.
I haven't gotten to watch too much of the trial, and I was hoping they had caught the right person, but what I've seen doesn't really indicate to me a case that I would have taken to a jury.