This is why trying to help Cassidy with a protocol is pointless. She does not have a point at which reason and logic can give her pause.
I'll say this again: There is no point at which you can be sure she will accept herself mistaken.
There is no reason. There is no logic. There is no technique. There is no education.
No matter how you tie it down, once the signal gets to her mind, the spirits start nattering away. You can show, to mathematical perfection, that input = output, but she will still discern the stuff she does.
There is no way you can change her predetermined mind.
You don't need to change my mind. You just need to look at the facts that are available.
The MD hash did not alter.
Rainfall & fan noises do not switch off simultaneously during playback, leaving blips behind.
There are two facts, not just the one fact.
The signal is not in my mind, and the spirits do not natter away, other than for beneficial purposes.