maybe sprinkle some lemon juice, vinegar, or repellent on the door.. and when she get it on her nose and has to lick it off, she will get grossed out and stop. I have bought some spray from the vet for scratching the furniture. It's like bitter apple, but that isn't what it tastes like.. it's REALLY gross.. I accidently tasted it once.. they eventually associate the smell with what it tastes like, and stop.

Besides, citrus is supposed to be good for polishing wood