With our new crackley saber, she’s probably already tried it once (but clearly it didn’t fully work). But yes, I suppose this would be the first time she’s tried it on a living being.
The reason I’d like to make this change is because lots of people point this out as a Mary Sue moment because there’s no explanation given for how she knows this and also I’ve heard people have the misconception that it’s the dyad which grants her this power.