Wilcox became the workshop supervisor for the Sesame Muppets, and remained in that post until her retirement in 1990. Her 1979 design sketch for a red monster would eventually become a star character as Elmo. As with the other designers, not all of her ideas reached fruition: she conceived and drew "Snuffy's Baby Brother," to be operated by one smaller person and "having only two legs when young (tadpole like). Mature is 4."