In the years 1930 to 1938 she worked on a prestigeous commission for the Elmhirsts to weave banners for the Great Hall at Dartington, Devon. These vertical, heavy wool hangings were intended to improve the accoustic for mucic performances and featured abstract designs symbolizing the estate's industries, agriculture and arts. They were woven in a weft inlay technique, using vat-dyed and vegetable-dyed yarns; Elizabeth Peacock had to learn vat dyeing especially for the work. Also in the 1930s, she studied drawloom weaving and built a drawloom at 'Weavers' with the expert on the subject, Alice Hindson, who was working with her from about 1933 to 1935.
Elizabeth Peacock's later researches encompassed fabrics for a project in collaboration with the archaeologist Jacquetta Hawkes. With her students from Redhill and Reigate School of Art, she wove reproduction material to clothe figures from ancient history for the 1951 Festival of Britain exhibition on London's South Bank. The various fabrics were accurate in fleece and yarn and woven on a reduced scale.
From its inception in 1931, Peacock was active in the Guild of Weavers, Spinners and Dyers (GWSD) and was chief organiser of its annual summer schools in the years 1931-40 and 1946-56. These were based at Redhill and Reigate School of Art, Surrey where she taught part-time for 17 years (1940-57). She retired from teaching at age 77 when failing eyesight became a restriction. Her final works were the 'Cottage Tapestries', woven in the inlay technique and composed of narrow strips. She died in July 1969.