She is finally introduced by name in the second Oz book "The Marvelous Land of Oz" (1904), where Baum elaborates more about her appearance in detail. She often wears a green silk knee-length skirt, matching silk stockings embroidered with peapods, and green satin slippers with bunches of fresh lettuce for decorations instead of bows or buckles. All around her silken waist four leaf clovers are delicately sewn into the sash and she wears a little jacket trimmed with sparkling emeralds of a uniform size. The reader also learns in the plot that she is a northern Gillikin by birth. Scarecrow, then the ruler of Oz in the Wizard's stead, uses Jellia to act as an interpreter between him and the Gillikin Jack Pumpkinhead, who does not realize that all Ozites speak the same language, so Jellia "translates" Jack's words as insults as a prank. After General Jinjur and Mombi have joined forces and taken over the Emerald City, Jellia is compelled to retain her job. She is brought before Mombi who uses her dark magic to exchange forms with Jellia in order to trick Glinda the Good Witch into thinking Mombi has surrendered herself, but Glinda is not fooled by this trick and undoes Mombi's curse. Jellia refuses to speak about what happened until Glinda promises to protect her from harm.