I would guess the issue with this is a lack of working short term memory. You could show her but she's not going to retain the information. By the time she saw photos in the story you just read, the worst of her episode had passed and she was returning back to normal. The issue is likely more to do with confusion and not understanding surroundings more than it has to do with not knowing who he is.
Its really not a video for her benefit. I hope it will keep her attention and calm her down, but I really believe there is the possibility of getting shot by some bystander and believe a video on her phone might calm the situation an allow people time to think.
