How to stop my mother-in-law from buying food for herself?

My mother-in-law cares about you and buys you food. It means you met a good mother-in-law. If you don't want your mother-in-law to buy food for you. You should buy food in advance. Let your mother-in-law know that you have bought the food! And let your mother-in-law know that you care about her. Don't want to make her tired. This way, you can get along well with your mother-in-law and daughter-in-law.