Yup, she has the Grilled Cheese aspiration. But I didn't have to eat Grilled Cheeses. It was the aspiration of a sim that moved into my house. (Her parents had her late in life and both died when she was a teenager, so her loyal half-brother and his wife took her in to help with their twins, rather than let her live with step cousins... haha)
When I moved her in (using household manager), she had the Grilled Cheese aspiration. Not sure if that's rare or common.
Then I got bored with not being able to advance the aspiration, so I changed her aspiration, hoping I could change it back... but I cannot change it back, and I don't seem to be able to re-trigger it.
I might give up on it for now.