Hi there Pamela,
Disney Moms Margaret, Jodi and I loved experiencing the new Hall of Presidents attraction and filming the video you mentioned. I took my two boys (ages 5 and 7) to the attraction this past summer and they both enjoyed it. My oldest son said he would like to see it again, while my little guy said he'd go back when he was a , "really old second grader." I spent some time explaining what they would see prior to entering, and we had many wonderful discussions about American History after coming out. Prior to the "meeting" the Presidents, the audience watches a film that highlights many key points in American history, including the Civil War, the assassination of JFK, and the events of September 11, 2001. The video is not graphic, however, honestly portrays some of these key milestones in our Nation's past. My mom is a retired history teacher, so my boys were at least somewhat familiar with some of what would be covered. I will say that the film is extremely moving, and as someone who worked in NY on September 11th, I had tears in my eyes at certain portions. I also had goose bumps when President Obama "took the stage!"
I am glad I decided to take my children to the attraction, but, to be certain that your daughter isn't overwhelmed, you may want to "test drive" it without her prior to taking her in.
Have a magical trip!
Tanya