Carlson helped to create the original models and designs for the "It's a Small World" attraction, which debuted at the 1964 New York World's Fair. She was one of a select group of artists and designers who were sent to New York City by Disney in order to create attractions for the World's Fair. Within the Disney Company, she became known as the artist who designed many of the famous ride's singing dolls. Following its debut at the World's Fair, "It's a Small World" opened first in Disneyland; Carlson later helped bring her signature attraction to Walt Disney World, Tokyo Disneyland, and Disneyland Paris .