I agree, this 'accident' talk is creepy and inappropriate
Honestly it sounds like something that a badly-raised teenager might do, not an adult. And as in that, I think the key is figuring out just what her problem is and setting her right hopefully. I honestly don't think it was a sane and rational action, and since in the end the cat (luckily) ended up fine - I think teaching her and everyone what was wrong about all this will do the society a lot more good than some sick vigilante 'justice'.