OMG! Well, you have to Love her before you off her.
Not really, I would be kind and firm. I would be kicking her out of my house with a kind and firm foot! There is only so much critique that one person can take, especially when they have way to much time on their hands, and it sounds unwarented.. There is, yet again, the option to lock your door, or not answering it at all. Just a thought.
PS, I also like the" Well, I will be in the garage if you need me," responce. If someone offered to clean out my refrigerator, I would totally take them up on it. My Grandma Chris when she came over to my house on Thanksgiving opened all of the cabnets and the door to the spare room, and offered a little critque, I just said Thank you, and nothing more was said.