We KNOW she was in there. Where she went while in the house is subject to debate. BVD said she didn't go upstairs, but we KNOW she lies/fails to tell the "whole" truth.
NO blood at DW's, BUT there is blood at the VD's? How did he take a "bloody" little girl into HIS house without leaving "a trace" of blood.
NO blood in the Forerunner either, so just how did he take this "bloody" girl to the MH without leaving blood ANYWHERE IN BETWEEN the VD home and the MH