Mrs. Mott is Greg Heffley's English teacher who is notable for her hatred of the Spineticklers book series. She appears in Double Down.
When Greg and nearly everyone else in the class chooses to do author biographies on I.M. Spooky, the author of Spineticklers, Mrs. Mott tells everyone that they will have to stay inside for recess until they redo their assignments. Greg believes that Mrs. Mott may have thought the class was trying to be funny by simultaneously selecting I.M. Spooky, as there is almost no publicly available information on him.
He also says that Mrs. Mott is getting sick of everyone doing Spineticklers book reports and notes that the previous week, five kids chose Spineticklers #97: My Teacher is a Cannibal for their reports, which just about pushed her over the edge, though the last straw was when a student named Amanda Pickler dropped a fake brain while doing a Book Talk on a Spineticklers book, causing two kids to pass out.