No, guess she's just been some where she shouldn't have? You could try bathing? Warm water and a sponge? I've washed two of my birds (one after it got stuck/wedged in dirt under some metal girders and another broody which broke an egg and had it all stuck to her belly). They didn't mind after the first minute. Then keep an eye on her to see if she goes somewhere the others don't or if there's something wrong.
Actually, I read about gape worm causing birds to salivate loads, which ends up stuck all over their head and makes them dirty. Think that was meant to smell bad too..? Just a thought.