While you can complain about the US having weak labor protection, I can tell you that, based on her description, is already illegal, and I have worked at two other companies in the US that take this very seriously. They almost never "fired" anyone but sadly did layoffs fairly often. They gave the appropriate notice and paid the promised severance. Even people that folks would have said deserved a during often got to hang out until the next layoff, because generally the risk of a labor law violation was not worth the notice and severance cost.

Over the last couple of decades working at companies, I have only seen four firings, but many many layoffs.

The four firing were: A guy that would show up for the morning meeting every day then leave work right after, hoping no one would notice. Fired after doing this for a week, getting a talking to to let him know we knew, then he kept doing it for another week before getting fired.

A guy who, in his first week, was on camera stealing 30 thousand dollars of equipment. He returned the equipment and the employer didn't even press charges.

A guy that would be at work, but do nothing but play with the equipment without ever doing a single thing he was asked. He lasted about 4 months before they finally gave up.

A guy who was walking around the parking lot yelling about how he was going to kill everyone while waving a pistol around.