She attempts to make the hammer by expanding the size of the head such that when weighted with coals it has enough heft, and adds a curved spike to one side of the hammer in the manner of a war hammer. Though the head may be slightly unwieldy and large as long as it can achieve sufficient force with a swing, it will do.
Then instead of making picks, she creates foot long triangular shaped wedges which can be driven into stone and destroy the structural integrity.
Then instead of making picks, she creates foot long triangular shaped wedges which can be driven into stone and destroy the structural integrity.