Fern and Persimmony Glitchet

Fern & Persimmony Glitchet is an episode of Season 10.

Plot
Fern's favorite author is Persimmony Glitchet. One day, she wants to write her own story and gets advice from Glitchet. When her story under the name Agatha Shelley gets published and the story is a disaster, Fern realizes that her old writing style suites her better, so she writes as she normally would and it is a hit.