Humbug Witch

From the dustjacket flap: Humbug Witch by Lorna Balian. There was this thing...ugly and terrible and dressed in its worst. It called itself a witch. It worked itself into a black lather whispering secret words and wishing witches' dark disasters. However for all this, nothing ever happened. Its commands were always ignored. Its magic potions never exploded. This thing called witch got discouraged. It took off its tall black hat. It took off its long black dress... and then the unexpected happened.