Gf getting harrased by ex

My gfs ex boyfriend recently got into her snapchat but she was able to luckily reset her password quickly but not before he stole pictures of her sadly. She since has put up 2FA on everything,thinking it was over and he would stop but just now, she recently got multiple attempts to reset password on her email on all her socials. What can we do to make sure she stays safe and prevent him from harassing her

2fa password pictures privacy quickly reset snapchat thinking