What home remedies can I use on my cat that keeps chewing off her fur?

She is constantly over-grooming, to the point of patches of fur starting to disappear. She's done this before, and she usually stops after a while, but this last time it's gotten a lot worse, and she even caused a scab (presumably). Without resorting to another trip to the vet, what home remedies could I use to dissuade her from this bad habit?