Could be her circadian ryhtyms are whacked.
Try staying awake 4 or more days straight. Things start getting a little strange.
Then why did she pack the plastic bags, steel mallet, knife, tubes, BB-gun, and mace? You can explain her setting out randomly if she went briefly crazy, but stocking her car with all of those items for a 1000 mile road trip indicates that she planned it. I'm not entirely sure if this was just an attempted kidnapping. I suppose we will learn in the next several months whether she planned to kill or maim the other woman.
The BB-gun , mallet and knife makes me think her intent was to torture and main rather than kill. Being repeatedly shot at close range with a BB-gun is going to hurt like hell. The mallet may have been for striking joints. The knife for the fear factor and possible disfigurement.