Proves nothing to me. If true, she was unaware of being in danger. The poster was saying that she appeared to think she was going to be driven back to the hotel, by whoever she was with.
The fact that she knew Sloot from earlier that day and probably the day before I think, made it so that when she was grabbed and tossed into the car, she may not have been overly worried at that point. That is just my take on what may have occured based on what those that were there said about her planning to walk with those just ahead.