From Farmer to Grain Tycoon

Modern woman transmigrates as Cora Rowan, treated as 'fool'. Once lucid, family's men conscripted. She leads family to flee famine during war. Using past life memories/brute strength, she protects family through famine, war, bandit attacks. After settling, builds family's fortune. Takes general as master, helps him ascend throne, becoming wealthy grain merchant. Realistic survival/farming story, no 'space'/'system' tropes.