Why ask all those questions? This isn’t about her knowing the owners, or an “issue”.
She has already been fired, let’s just hope for some criminal charges.
Because YOU are implying that she knew the cat, knew who owned the cat and killed it anyway because she’s nuts. And maybe that is the truth. Or maybe my explanation for what she did is the truth. Or maybe it’s neither. Your explanation, at worst, makes her a jerk.