it's hilarious because people take snaps of me doing morally degrading stuff to myself all the time and i just laugh because its giving me fame in the process
you can either shrug it off and have a laugh at it too. if you honestly didn't feel comfortable, just do it back to her but worse and put that stuff on instagram. if you're too pusillanimous individual to do that just report it and she'll probably get a day suspension at worst.