Don't tell her she is right, tell her she tipped over the gas can in the garage and the whole place could have gone up in flames. Then she will stay out of the garage and will be more likely to not find your stash of reciepts, or parts hiding in the garage. Tell her to stay out of your garage, and you will stay out of her kitchen and laundry room.
I gotta run, Mrs. Roofman is coming up the stairs now..........