Sorry to disappoint but things are a lot less mysterious than you may be thinking, lol. A comment below called it. United States, new-age/pagan and Gardnerian Wicca. I was raised in it but no longer believe.
Lol, no one is buried in salt for real. Salt is used for what they call “grounding”, and warding/protection, and cleansing (it’s versatile) which is what she was referring to.
I mean…I can’t say no one has ever gotten into a bathtub and filled it with salt but um…that’s not really what she was talking about. Or is it? Who knows.
I’d say Google it for more info but also I am absolutely afraid of what nonsense may come up and make the situation look more ridiculous than what actually was happening.
What she was saying was the equivalent of a superstitions person doing something to ward off the “evil eye” n whatnot. Think a long the lines of spitting on the ground after saying a bad thing, throwing salt over your shoulder, knock on wood, etc.