It is totally incredible to me that a person not familiar with, and at least formerly welcome on, these premises could have done this. No sign of a struggle or hasty grab of a person in blankets, etc. You tell ME how a stranger could have got the girl out of bed and down stairs and out of a house with 6 adults and 2 children in it, etc.--unless perhaps the girl knew him/them, and went with them voluntarily on her own accord.
I just don't think there is any evidence that anyone was forcefully abducted at all! Looks like Danielle (trusted perhaps not validly) and left voluntarily with the perpetrator, unless it was someone trying to save her as above poster has said...
Also, why all this about the middle of the night? If the "guests" in the garage left finally at 5 or so, and the parents were passed out somewhere, what is to keep Danielle from waking at daybreak, playing outside in the yard, going off to McDonalds with friendly adult frequently seen in the house, etc.
Why this absolutely ludicrous dispute over whether W and Mrs VD danced? That should be easily confirmable by interviewing those at the club...and might they have MORE THAN DANCED, such as in the parking lot etc? Why the argument early on that they were really strangers, had met only when he bought girl scout cookies, and now it seems [maybe, who knows who is lying] they knew each other fairly WELL?
She looked so non credible on that little point, that I think she DID in fact actually look in on the children, and found them to be OK.
Perhaps her intent at the club was to collect samples that could be planted at the crime scene (hair and other) - let's wait and see what evidence the SDPD comes up with before continuing this line of thought.
I would answer this question with the theory I have posted on this and other threads: one of the "guests" at the "party" excuses self to get snack from kitchen, or, perhaps, to use the bathroom. No one particularly misses said guest because they are otherwise occupied. He's been there before; goes upstairs, either carries out a sleeping child OR gets her to walk out with him. Might be Westerfield: the van Dams have lied quite a bit already, what would be surprising if they lied about knowing Westerfield? Or it might be another guest altogether. But it seems more and more like they came in and left through a regular door, not over that wall.