There is a scannable interaction in the tower hangar related to Amanda. As you emter the hangar, continue straight past Amanda across the soccer area. You will see some stairs and a wall with diagonal beams. Use the diagonal beams to climb the wall until you get to a ledge. You will find a book and some papers you can scan. It's an autobiography someone is writing about Amanda called Fly Girl. It says Amanda was born on the road outside the city and she lost her whole family to the Fallen. I would assume that might be how she lost her leg.