You know, in my heart of hearts I do think she was abducted, either by some plan with the folks in the car or what I don't know. But what is bugging me now is 'The Plan' the G's wrote with the date January, 16, 1973. If Anna fell into the creek that day, what a coincidence for dates!
what if things did not go as they had planned that day and she did fall into the creak, then there would have been no plan
i believe that she was taken, and is still alive.