My other half discovered that some dodgy person/company had managed to send instagram messages to all of her followers from her account. She changed her password immediately, but what could have happened here? Is it the case that a “hacker” had access to her full instagram account, or would they have used some tool that allows posting of messages via some kind of proxy without requiring access to her actual account? There was no record of other logged in devices on the security page of her account.