Voigt studied coastal molluscan fauna, particularly at Klasies River Mouth, and conducted ethnoarchaeological research on shellfish diets.
The main thrust of Voigt's subsequent faunal work, however, was wide-ranging analysis of animal bones from Southern African Iron Age sites dating between A.D. 200 and 1800, and especially at Mapungubwe, with a focus on diet, economy and domesticated breeds.
Her Masters dissertation at University of Pretoria was published as a book by the Transvaal Museum under the title, Mapungubwe: an archaeozoological interpretation of an Iron Age community.
Apart from studying the diets, climates and economies revealed through the seashells and bones of the past, Voigt increasingly devoted attention to matters museological.
While she held junior and part-time lectureships at the Universities of Cape Town and Pretoria, it was primarily in museums that she developed her subsequent career.
She played a vital role on the committee which promoted professional standards and produced the graded museum accreditation scheme for South Africa in 1996.
Traditionally as centres for research and for engaging the public in displays and in other ways, museums most crucially fulfil a curational role for archaeological and other collections.