Board Thread:General Discussion/@comment-9219983-20131108055117/@comment-136.224.223.81-20131111052630

She did have a backpack in the fight sceen. It exactly like how Nora had no trace of her grenade launcher on her until the scene in episode 8 where she finaly pulls it off her back and fires at the nevermore.

I wouldn't be surprised if she has cybernetics or some kind of body modification, and spent an extremely sheltered childhood in a lab, so while she was human she tended to act robotis in nature.