According to the weather reports it wasn't raining until later in the day.
To me, it doesn't make any difference whether she willingly accepted a ride or not. The fact is, her cell phone was found a short distance from her house, thrown from the vehicle. Now, LE has her cell pings and would be able to pinpoint the time the cell was thrown in that location. If it was thrown immediately, that would be an indication that she met foul play right away. So, regardly of whether she got in the vehicle willingly or not, she would still be considered kidnapped at that point and time.
As far as her dropping her things. I am still not convinced that she had a arm full of books and a purse. It was never clearly stated as fact. She could have just had the purse as maybe she wasn't lugging a bunch of books that day. I am following another case here where the girl was went missing riding her bike. Whoever took her, also took her bike instead of just leaving it lay. Unfortunately, it was a good move by the perp because it bought him/her time in the investigation.
I, like you would most likely think that someone would scream in this kind of a situation except for the fact that I have been in situations and unfortunately froze due to fear that if I did scream it would result in my death. When someone points a gun at you and tells you don't move or speak or I'll kill you, it's pretty scary. I chose to obey to try and by some time and eventually I was able to outwit the perpetrator and get away. I was very lucky, it could have easily gone wrong at any time.
