Special note:

She "not has" special skills in cooking

You know it's bad when a Hilichurl is lecturing you on proper cooking techniques.

She's already crying and she hasn't even gotten to chopping the onion.

Since she absolutely loves sweets and now is even willingly open to trying out new varieties of her old favorites, perhaps starting with teaching her how to bake desserts might be better encouragement to learn cooking instead of going straight for the boring old meat and veggie meal prep?

If Raiden Shogun is Raiden Mei's ancestor it would be hilarious for them to meet each other, due to the fact that Raiden Mei is the best cook in Schicksal.