Even her original 'hex bolts' power could give someone a stroke (although, per the Marvel Handbook, she *chose* what 'bad thing' happened to her target, and could do so reliably for *hours* of casting hex bolt after hex bolt, so she just didn't ever *choose* to give someone an embolism, or some other fatal bodily malfunction).
She was never not a lethal weapon, loaded and ready to fire. Anything that could go wrong, she could make happen, right now. Oops, the street just collapsed under your feet and you caught the A-train. (Or, more accurately, it caught you.) Oops, a city bus just swerved out of control and ran you over. Oops, apparently 'blue ice' falling from the sky is not an urban myth. Oops, heart attack. Too many cheeseburgers, I guess...
What are the odds that one of the SHIELD drones monitoring this super-event would suck a bit of debris into a fan and spiral out of control, only to hit you and then explosively self-destruct? 100%, apparently, 'cause it just happened!
Long before Bendis and 'reality manipulation' (or 'chaos magic' before that) she was capable of being a supreme badass with her original power, in the hands of a writer with an ounce of creativity.