I think we should encourage each other appropriately. After all, she cooks for you because she cares about you. If you say too directly that her cooking is terrible, it may cause her dissatisfaction, and two people may quarrel, so try to tell her politely.

If you really can't stand it, tell her that you can't stand her hard work and other sweet words, and tell her that oil smoke is bad for a woman's skin, so that she will not only be angry, but also think that you are considerate. Isn't this the best of both worlds?

Finally, if she still insists on cooking, she can be gently given a cooking class. After all, no one is born with it, but she can learn it the day after tomorrow. So that you can all eat at home in the future.