Catherine is Ivan's wife. She and her husband serve as the circus' illusionists.
Catherine and her husband Ivan witness Joe and Milly running past them, telling them that she and Ivan will be coming. Catherine and her husband later stand next to each other near Holt just as he introduces the couple by name. After a reminder from Max Medici, Catherine and the other workers return to work to continue building the tent. The next day, Catherine and the other performers gaze upon Baby Jumbo, recently born to Mrs. Jumbo in awe. She and her husband Ivan later entertain guests at nighttime in front of some guests in the freak show section.
The next day, Catherine and the other performers sadly gaze upon Mrs. Jumbo being taken away just as Dumbo is sent to perform in the clown act, no longer including him in the elephant act. Later during Dumbo's next act, Catherine and her husband watch Dumbo in the role of a firefighter clown and as the platform begins to collapse due to one of the clowns' clumsiness, Catherine and her husband become fearful about this; thanks to Milly's help, Dumbo manages to fly around the circus.
Furthermore, Catherine and the other performers travel to Arkansas in the Dreamland attraction as Dumbo's act was a success. After it is found out that Vandevere Enterprises has fried all the circus performers, Holt, his children Joe and Milly, and the circus performers plan to rescue Dumbo by releasing back into the wild him alongside his mother. Catherine plays an important role in arriving at Nightmare Island by where he and the other performers barge into the attraction as she and Ivan work together to put in the fog effects to distract the dangerous animals and to turn of the lights to confuse the guards just as the performers take the transport vehicle with Mrs. Jumbo in it just before the park owner V.A. Vandevere and his guards try to stop the circus troupe. Later, Catherine, Holt's family, and the rest of the circus performers spend their last moments with Dumbo and his mother before they get released into the jungle.
At the end of the film, Catherine and her husband Ivan are seen releasing a dove as part of a new policy of not including wild animals in the circus.
- Her name is derived from Catherine the Great, a historical figure from Russia.
- According to the English Audio Description, Catherine is identified having Latin American roots.