As a daughter-in-law, we must understand her mother-in-law, because her mother-in-law is a person who has come from hard times. They all cherish food very much. It is precisely because of this spirit that they have a good life. This is the habit of her mother-in-law.
Now that people have a good life, the daughter-in-law should also tell this truth to her mother-in-law, so that her mother-in-law can know that leftovers can't always be eaten. The daughter-in-law should reason with her mother-in-law more carefully and patiently, so that her mother-in-law can listen.
The best way is for the daughter-in-law to learn to cook. Although it is not delicious, it will be encouraged by her mother-in-law. After learning to cook, she should cook according to the number of people and the amount of food she eats every day, so that there will be no rice left.
Ask the family who doesn't eat before cooking every day, try to make it delicious and reduce the surplus of food. Even if it is dumped, my mother-in-law won't say anything.