Then get some mushroom spawn , shade , moisture .
Eggplant makes a good Italian substitute for meat.
Or introduce her to sweet herbs that grow and enhance the flavor of meat : basil, marjoram, mint, rosemary, bay leaf , sage and thyme .
Cook meatballs with NO herbs - just blah ! .
Then cook a meatball with one of the above sweet herbs
Then cook another meatball with another one of the sweet herbs .
Then she can tell you what she liked best- and tell her what herb was in there.
It will at least peak her interest ( I hope )
LOL. If you knew her, and all the things we have already tried, you wouldn’t even have mentioned it. LOL