Duchess Ravenwaves came very close to cutting Lady's hair at times, especially in "Vanished," where she held a Pixietail hostage, then ordered that all the Pixietails leave them alone, including the one she was holding. She was only foiled when a Pixietail too far away to hear the order snatched away her scissors.
In "Lake of Reflections," Hairball casts a spell that traps Lady's reflection under ice, weakening her power to summon the Pixietails. She ends up doing a lot of the work herself, especially in the final segment where she rides a makeshift sled and evades Hairball's magic.
In "Fire in the Sky" a giant fireball is menacing the kingdom, and Duchess Ravenwaves builds a dam to ration the water supply. The Pixietails help get the excess water to Shining Glory, who casts a spell that shoots the water at the fireball, cooling it off and saving the kingdom.