She could. Hell, Rey rendered the whole city in flames at one point, even if it were by no choice of her own. She still did, she still could. But destruction won't solve this.

"Because things have changed since then. We know more now than we did back then, such as what will happen if you succeed. You kill the gods, everything dies. We die." Rey grits her teeth, hands clammy. This is going about as well as she expected it would. And yet there is one fear that lingers on Rey's mind. "You die -- or worse."

Maketh becoming the very thing she was trying not to would destroy her.