[Maritime Q-Scout]

Watching video, she says

"The next person that says to me 'all lives matter' I'm gonna stab you, then show you my paper cut and say 'my cut matters too!'"

Obviously a joke demonstrating the idiocy of the All Lives Matter movement.

No reasonable person would take that as a threat. Mind you, you aren't dealing with reasonable people here, but still there was no actual threat.

This wasn't stupidity on her part, this is either (a) the company not wanting to have an employee who supports BLM, or (b) the employee lost their job due to the travel ban and couldn't actually get to the UK to work and are trying to politicize this to get their job (which they can't get to) back.