Ha! Makes sense to me. If you have enough raisins you can make a fruitcake, and she's crazy as a fruitcake the way I see it. :D
Next Halloween costume- check.
Just a friendly tip, wear something that reminds people who you're dressing as, like a t-shirt that reads "tanning mom". Otherwise they might think you're going out dressed in blackface. And depending on the neighborhood that might be a really bad idea.