Miss Arabella Hempnettle was the best friend of Miss Drill.
Arabella and Miss Drill were best friends and competed in the Witch World Games, however when she saw Miss Drill was about to win, she pushed her off her broomstick and Arabella won. Arabella then became a teacher at Miss Cackle's Academy for Witches, and coached Enid Nightshade. But she double-crossed Enid. She was later proven to have pushed Miss Drill and was turned into a worm by Miss Drill for physically hurting her on purpose, and kept in a jar. Though it was never mentioned, Miss Drill mentioned she would talk to the Great Wizard, and she was presumably imprisoned for her crimes.