Uploading a private conversation with HR to TikTok surely isn't going to help her job hunting. Prospective employers might view such behavior as a red flag... It might even be illegal given that the HR people are likely located in California, a "two-party consent" state.
But on prospective employers, perhaps she doesn't need future employers who'd be pissed at their shitty HR drones getting exposed on social media ? She might not need to go work at a Fortune 500 company lawyered to the teeth, and could find a nice place that is willing to commit to higher standard of communication with their employees ?
I had a coworker go shout insanities at the CEO at a meeting after the company pushed a few of his buttons, it was totally unprofessional and a hot headed move, but I'd still see him as a good hire in a different setting. People can have flaws and bitch too much publicly and still be valuable workers in the right contexts.