 Plug held the post of Deputy Director at the Transvaal Museum and was also the Head Curator of the Department of Archaeozoology, until she retired in 1999.During her career, apart from writing papers and books based on her research which covered Early Stone Age, the Middle Stone Age and the hunter-gatherers of the Later Stone Age, she was also involved in training a large number of students in the field of anthropology, history, archaeology and wildlife from different institutions across the country.Plug's research work has contributed richly to subjects of "faunal quantification, taphonomy, animal distributions, past environments and modern wildlife."