According to one of the witnesses, SHE requested the photo op to toughen HER image. It wasn't about the officers, it was about her. So maybe it doesn't make her a hypocrite, but it does make her a political opportunist which in my book is just as bad if not worse.
Toughening your image by posing with cops and soldiers, and their equipment, is not antithetical to being against civilian ownership of "assault" weapons.