If she had demanded a contract, she wouldn't have gotten the job in the first place. Why would Musk give her a contract? What's in it for him?

If someone working for you doesn't have a contract, how does justify your maltreating them? It does not.

If you rely on the fairness and kindness of someone and they fuck you over, they are morally to blame for being antisocial personalities, not you.

If someone works for you for twelve years and then you fire them simply for asking for a raise, you're just a shitty human being, whether or not you have the legal right to do that.