Her Superpowered Iron Fortress

Modern geological engineering PhD Liora Hale time-travels to the Great Qian frontier. Using her strength and expertise, she digs springs, controls floods, mines ore, and improves land, working alongside her soldier husband Nolan Hale to bring down corrupt official Marcus Qian. When the frontier is under attack, she designs an iron fortress, refines the Divine Arm Crossbow, and repels the Northern Tribes. She is granted an imperial edict and builds a prosperous frontier.