Lair of the Lost Girl

I'm glad you're able to deal with this.

One thing to consider: she might be a bit lacking in empathy, and the only way to avoid being over-critical is to be over-nice.

Another thing that might help - if you can come up with a direct question about the technique.

"Oh, you did that beautifully!"

"Yes, but I was thinking - do you think it would work better if I'd been able to X?"

That could short-circuit the "pretend to be nice and encouraging" and put her into thinking/instructing mode.

(As always, one should be cautious about listening to the advice of strange men you met on the internet.)