She's Emily Youcis (aka: Pistachio Girl). She's been traveling with him ever since she met him in NYC. Her backup videographer work serves as an added security of sorts to Little who is exposing himself to great danger.
I'm surprised he hasn't been on the receiving end of more aggression. One man elbowed his sign in a NY crosswalk and a few women have shouted at him in the crowd. One man wearing a yarmulke repeated, "You have a lot of nerve!" several times. One obnoxious boy imposed his own body between the camera and Little, so after that the cameraman had tried to deny that he was associated. You can hear him reply to several people saying "No" when they ask if he's his cameraman.