One of her ten top fictional headmistresses, as shared at the Guardian:
Miss Cackle in The Worst Witch by Jill MurphyRead about the other entries on the list.
The most powerful headmistresses, of course, have no need of threats or tirades, but can quell the unruliest classroom with the slightest frown. Miss Cackle, the kindly headmistress of Miss Cackle’s Academy for Witches, located in an old castle on top of a mountain, is an exemplar of the genre. In contrast to the Academy’s “horrifically strict” Potions Teacher Miss Hardbroom, Miss Cackle’s power lies in her popularity, which inspires every child with a dread of displeasing her. Her mild rebukes - “You must be the worst witch in the entire school … It’s just not good enough, my dear” – are always delivered with a patient sigh, but leave the squirming Mildred Hubble feeling “about an inch high”.