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The Naughtiest Girl Helps a Friend is the second of Anne Digby's continuation of the "The Naughtiest Girl" series (originally by Enid Blyton), and the sixth book about Elizabeth Allen, the "Naughtiest Girl" of the title.
The Naughtiest Girl Keeps a Secret (1999) is the first of a continuation of Enid Blyton's The Naughtiest Girl series by Anne Digby.