There's a lot of evidence to suggest most of her research was fraudulent

I wonder how much of it was just a https://en.wikipedia.org/wiki/Clever_Hans situation

Almost all of it was exactly this.

That's why it's never been done again. Because it was never done in the first place.

And at least in Hans' case, the general public could instantly verify the result, as opposed to having it interpreted by a biased handler.