Then I noticed that the mirror behind the toilet (she has to stand on the toilet to reach the mirror) was smeared with something. Next I noted the open vat of Vaseline (Costco, thanks) and figured out what the pre-duck-washing activity must have been. It turns out that Vaseline is not hard to wash off of mirrors at all and the rest of the night went smoothly as well.
The best part about being really tired is how great the bed feels when you go to sleep, for the 3.5 minutes that you feel anything at all. I woke up feeling fantastic. The weather could be nicer, and it was an unpleasant surprise to learn that the Vaseline application had not been done entirely by hand--I surmised this immediately prior to brushing my teeth--but otherwise the morning has been flawless. Not flossless!